feat(install): stamp username into account_name.txt after install

Some games ship an `account_name.txt` file somewhere under the unpacked
`local/` tree (location varies per game). After install or update, write
the configured username into the first such file we find so the game
launches under the user's account instead of whatever default the
archive contains.

The search is a deterministic alphabetical DFS rooted at the install
staging dir (`.local.installing/`, which becomes `local/` on rename),
stopping at the first regular-file match. Symlinks named
`account_name.txt` are skipped (`is_file()` is false for symlinks on
Linux), so a hostile archive can't redirect the write outside the game
tree. If no `account_name.txt` exists anywhere in the install, the step
is a no-op. If the write fails, the existing install rollback (cleanup
of staging on fresh installs, restore from backup on updates) handles
it — no partial state is left behind.

The username flows from the Tauri layer, where it is already sanitized
by `sanitize_username`, down through `PeerCommand` variants
(`InstallGame`, `DownloadGameFiles`, `DownloadGameFilesWithOptions`)
into `install`/`update`, which now take an `Option<&str> account_name`.
For the "install game that isn't downloaded yet" path the username has
to bridge the async gap between the `GetGame` / `FetchLatestFromPeers`
request and the eventual `GotGameFiles` event; we park it in a
per-game-id map on `LanSpreadState` and pop it when forwarding the
download command. The map is also cleared defensively on
`cancel_download`, `DownloadGameFilesFailed`, and
`DownloadGameFilesAllPeersGone` so a stale entry can't bleed into a
subsequent install with a different username.

`PeerCommand` is the in-process command channel, not the wire protocol;
no on-wire types changed, so the "one wire version" policy is
preserved. The peer-cli harness keeps passing `account_name: None`
since it tests peer interop, not user-facing settings.

# Test Plan

Unit tests in `crates/lanspread-peer/src/install/transaction.rs`:
- `install_overwrites_first_account_name_file` — unpacker creates
  `a/account_name.txt` and `z/account_name.txt`; after install with
  username "Alice", `a/` is overwritten and `z/` is left untouched,
  pinning the sorted-DFS "first match wins" behavior.
- `install_account_name_missing_file_is_noop` — install with a
  username but no `account_name.txt` anywhere in the archive
  succeeds and creates no spurious file.

Manual GUI check: in Settings, set a username; install a game whose
archive contains `account_name.txt`; open `local/` and confirm the
file now holds the configured username. Repeat for the update flow
(install, change username, click update).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Cargo.lock

@@ -2209,6 +2209,7 @@ dependencies = [
  "log",
  "mimalloc",
  "serde",
+ "serde_json",
  "tauri",
  "tauri-build",
  "tauri-plugin-dialog",

IMPL_DECISIONS.md

@@ -5,9 +5,10 @@
   directly.
 - Renamed the frontend success event to `game-install-finished`; the old
   unpack name no longer matched the transactional install/update lifecycle.
-- Implemented watcher rescans by reusing the existing `.lanspread/library_index.json`
-  cache and updating a single game entry in that index. This satisfies the
-  per-ID optimized rescan requirement without adding a second cache format.
+- Implemented watcher rescans by reusing the app-state
+  `local_library/index.json` cache and updating a single game entry in that
+  index. This satisfies the per-ID optimized rescan requirement without adding a
+  second cache format.
 - Split full startup recovery from ordinary settled refreshes. Startup and real
   `SetGameDir` changes run recovery plus a scan; install/update/uninstall
   completion only rescans the affected game after operation tracking has been

crates/lanspread-peer-cli/scripts/run_extended_scenarios.py

@@ -592,27 +592,30 @@ class Runner:
         return "small bfbc2 and large alienswarm transfers both diffed cleanly against sources"
 
     def s14_large_multi_peer_chunking(self) -> str:
-        alpha = self.peer("s14-alpha", games_dir=FIXTURES / "fixture-alpha", readonly_games=True)
+        game_id = PERF_GAME_ID
+        source_dir = self.fixture_root / "s14-alpha"
+        create_large_sparse_game(source_dir / game_id, size=CHUNK_SIZE + 1024 * 1024)
+        alpha = self.peer("s14-alpha", games_dir=source_dir)
         stage = self.peer("s14-stage")
         connect_many(stage, [alpha])
         waiter = LineWaiter(len(stage.output))
-        stage.send({"cmd": "download", "game_id": "alienswarm", "install": False})
-        stage.wait_for(event_is("download-finished", "alienswarm"), timeout=90, description="stage finish", waiter=waiter)
-        diff_game_dirs(FIXTURES / "fixture-alpha" / "alienswarm", stage.host_games_dir / "alienswarm")
+        stage.send({"cmd": "download", "game_id": game_id, "install": False})
+        stage.wait_for(event_is("download-finished", game_id), timeout=90, description="stage finish", waiter=waiter)
+        diff_game_dirs(source_dir / game_id, stage.host_games_dir / game_id)
         client = self.peer("s14-client")
         connect_many(client, [alpha, stage])
-        wait_remote_game(client, "alienswarm", peer_count=2)
+        wait_remote_game(client, game_id, peer_count=2, version="20260520")
         waiter = LineWaiter(len(client.output))
-        client.send({"cmd": "download", "game_id": "alienswarm", "install": False})
-        client.wait_for(event_is("download-finished", "alienswarm"), timeout=90, description="client finish", waiter=waiter)
-        diff_game_dirs(FIXTURES / "fixture-alpha" / "alienswarm", client.host_games_dir / "alienswarm")
-        totals = chunk_totals(client, "alienswarm", "alienswarm/alienswarm.eti")
+        client.send({"cmd": "download", "game_id": game_id, "install": False})
+        client.wait_for(event_is("download-finished", game_id), timeout=90, description="client finish", waiter=waiter)
+        diff_game_dirs(source_dir / game_id, client.host_games_dir / game_id)
+        totals = chunk_totals(client, game_id, f"{game_id}/{game_id}.eti")
         if len(totals) < 2:
             raise ScenarioError(f"expected chunks from two peers, got {totals}")
         values = list(totals.values())
         if max(values) - min(values) > CHUNK_SIZE:
             raise ScenarioError(f"chunk totals not balanced within one chunk: {totals}")
-        return f"alienswarm downloaded from two sources, diff matched, chunk totals={totals}"
+        return f"{game_id} downloaded from two sources, diff matched, chunk totals={totals}"
 
     def s15_three_way_version_skew(self) -> str:
         specs = [("s15-a", "20250101"), ("s15-b", "20250201"), ("s15-c", "20250301")]

crates/lanspread-peer-cli/src/main.rs

@@ -24,6 +24,7 @@ use lanspread_peer::{
     PeerRuntimeHandle,
     PeerSnapshot,
     PeerStartOptions,
+    migrate_legacy_state,
     start_peer_with_options,
 };
 use lanspread_peer_cli::{
@@ -125,6 +126,7 @@ async fn main() -> eyre::Result<()> {
 
     let fixture_seeds = seed_fixtures(&args.games_dir, &args.fixtures)?;
     let catalog = load_catalog(args.catalog_db.as_deref(), &fixture_seeds).await;
+    let migration = migrate_legacy_state(&args.games_dir, &args.state_dir).await;
 
     let (tx_events, rx_events) = mpsc::unbounded_channel();
     let peer_game_db = Arc::new(RwLock::new(PeerGameDB::new()));
@@ -162,6 +164,7 @@ async fn main() -> eyre::Result<()> {
             "name": args.name,
             "games_dir": args.games_dir,
             "state_dir": args.state_dir,
+            "migration": migration,
             "fixtures": fixture_seeds,
         }),
     ));
@@ -237,6 +240,7 @@ async fn handle_command(
                 id: game_id.clone(),
                 file_descriptions: files,
                 install_after_download: *install_after_download,
+                account_name: None,
             })?;
             Ok(json!({"queued": true, "game_id": game_id, "install": install_after_download}))
         }
@@ -245,6 +249,7 @@ async fn handle_command(
             ensure_no_active_operation(shared, game_id).await?;
             sender.send(PeerCommand::InstallGame {
                 id: game_id.clone(),
+                account_name: None,
             })?;
             Ok(json!({"queued": true, "game_id": game_id}))
         }

crates/lanspread-peer/ARCHITECTURE.md

@@ -124,7 +124,8 @@ Reserved per-game paths:
 - `.local.installing/` is extraction staging.
 - `.local.backup/` holds the previous install while an update or uninstall is in
   flight.
-- `.lanspread.json` is the atomic per-game intent log.
+- `games/<game_id>/install_intent.json` in the configured state directory is the
+  atomic per-game intent log.
 - `.lanspread_owned` inside `.local.*` directories proves Lanspread ownership
   when the current intent is `None`.
 
@@ -133,11 +134,17 @@ game root only for a catalog ID that is a single direct child of the configured
 game directory, has a regular root-level `version.ini`, and has no `local/`,
 `.local.installing/`, or `.local.backup/` path.
 
-Recovery reads `.lanspread.json` and combines the recorded intent with the
-observed `local/`, `.local.installing/`, and `.local.backup/` state. Intent
-states `Installing`, `Updating`, and `Uninstalling` prove ownership of the
-corresponding reserved directories even if the marker was not flushed before a
-crash. With intent `None`, markerless `.local.*` directories are left untouched.
+Recovery reads app-state `install_intent.json` and combines the recorded intent
+with the observed `local/`, `.local.installing/`, and `.local.backup/` state.
+Intent states `Installing`, `Updating`, and `Uninstalling` prove ownership of
+the corresponding reserved directories even if the marker was not flushed before
+a crash. With intent `None`, markerless `.local.*` directories are left
+untouched.
+
+Legacy `.lanspread/`, `.lanspread.json`, `.lanspread.json.tmp`,
+`.softlan_game_installed`, and `local/.softlan_first_start_done` files are
+handled only by the dedicated pre-start migration phase. Normal operation does
+not read legacy state paths.
 
 ### Result
 
@@ -195,8 +202,8 @@ Most scans become O(number of game dirs), with full recursion only when needed.
    - Cache the last accepted `manifest_hash` per peer to short-circuit
      manifest requests when unchanged.
 5. Local index + scan optimizations:
-   - Introduce a cached index file (e.g., `.lanspread/index.json`) that stores
-     per-root fingerprints and computed manifests.
+   - Use the cached `local_library/index.json` file in the configured state
+     directory to store per-root fingerprints and computed manifests.
    - Use filesystem watchers with a debounce window to collect changes and
      incrementally update the cache.
    - Schedule a low-frequency full scan to reconcile missed watcher events.

crates/lanspread-peer/README.md

@@ -97,16 +97,21 @@ truth for whether a download is still running.
 
 Install, update, uninstall, downloaded-file removal, and startup recovery live
 under `src/install/`.
-Each game root has an atomic `.lanspread.json` intent log for install-side
-operations and uses Lanspread-owned `.local.installing/` and `.local.backup/`
-directories marked by `.lanspread_owned`. Startup recovery combines the recorded
-intent with the observed filesystem state and only deletes reserved directories
-when intent or marker ownership proves they belong to Lanspread.
+Install-side operation intent is stored atomically under the configured peer
+state directory, at `games/<game_id>/install_intent.json`. Game roots still use
+Lanspread-owned `.local.installing/` and `.local.backup/` directories marked by
+`.lanspread_owned`. Startup recovery combines the recorded intent with the
+observed filesystem state and only deletes reserved directories when intent or
+marker ownership proves they belong to Lanspread.
 Downloaded-file removal is deliberately separate from uninstall: it only accepts
 catalog IDs that are direct children of the configured game directory, refuses
 installed or in-flight roots, and deletes the whole game root only after finding
 a regular root-level `version.ini` sentinel.
 
+Legacy launcher-owned files in game directories are migrated by a dedicated
+pre-start phase. Normal install, recovery, scan, and transfer paths use only the
+configured state directory for launcher-owned metadata.
+
 ## Integration with `lanspread-tauri-deno-ts`
 
 The Tauri application embeds this crate in

crates/lanspread-peer/src/context.rs

@@ -32,6 +32,7 @@ pub enum OperationKind {
 #[derive(Clone)]
 pub struct Ctx {
     pub game_dir: Arc<RwLock<PathBuf>>,
+    pub state_dir: Arc<PathBuf>,
     pub local_game_db: Arc<RwLock<Option<GameDB>>>,
     pub local_library: Arc<RwLock<LocalLibraryState>>,
     pub peer_game_db: Arc<RwLock<PeerGameDB>>,
@@ -79,6 +80,7 @@ impl Ctx {
         peer_game_db: Arc<RwLock<PeerGameDB>>,
         peer_id: String,
         game_dir: PathBuf,
+        state_dir: PathBuf,
         unpacker: Arc<dyn Unpacker>,
         shutdown: CancellationToken,
         task_tracker: TaskTracker,
@@ -86,6 +88,7 @@ impl Ctx {
     ) -> Self {
         Self {
             game_dir: Arc::new(RwLock::new(game_dir)),
+            state_dir: Arc::new(state_dir),
             local_game_db: Arc::new(RwLock::new(None)),
             local_library: Arc::new(RwLock::new(LocalLibraryState::empty())),
             peer_game_db,

crates/lanspread-peer/src/download/orchestrator.rs

@@ -43,25 +43,14 @@ pub async fn download_game_files(
         eyre::bail!("download cancelled for game {game_id}");
     }
 
-    let (version_desc, transfer_descs) =
-        extract_version_descriptor(game_id, game_file_descs, &tx_notify_ui)?;
+    let (version_desc, transfer_descs) = extract_version_descriptor(game_id, game_file_descs)?;
     let version_buffer = match VersionIniBuffer::new(&version_desc) {
         Ok(buffer) => Arc::new(buffer),
-        Err(err) => {
-            tx_notify_ui.send(PeerEvent::DownloadGameFilesFailed {
-                id: game_id.to_string(),
-            })?;
-            return Err(err);
-        }
+        Err(err) => return Err(err),
     };
     let game_root = games_folder.join(game_id);
 
-    if let Err(err) = begin_version_ini_transaction(&game_root).await {
-        tx_notify_ui.send(PeerEvent::DownloadGameFilesFailed {
-            id: game_id.to_string(),
-        })?;
-        return Err(err);
-    }
+    begin_version_ini_transaction(&game_root).await?;
     if cancel_token.is_cancelled() {
         rollback_version_ini_transaction(&game_root).await;
         discard_cancelled_download_best_effort(&games_folder, game_id).await;
@@ -73,9 +62,6 @@ pub async fn download_game_files(
             discard_cancelled_download_best_effort(&games_folder, game_id).await;
             eyre::bail!("download cancelled for game {game_id}");
         }
-        tx_notify_ui.send(PeerEvent::DownloadGameFilesFailed {
-            id: game_id.to_string(),
-        })?;
         return Err(err);
     }
     if cancel_token.is_cancelled() {
@@ -111,10 +97,6 @@ pub async fn download_game_files(
         rollback_version_ini_transaction(&game_root).await;
         if cancel_token.is_cancelled() {
             discard_cancelled_download_best_effort(&games_folder, game_id).await;
-        } else {
-            tx_notify_ui.send(PeerEvent::DownloadGameFilesFailed {
-                id: game_id.to_string(),
-            })?;
         }
         return Err(err);
     }
@@ -127,15 +109,9 @@ pub async fn download_game_files(
 
     if let Err(err) = commit_version_ini_buffer(&game_root, &version_buffer).await {
         rollback_version_ini_transaction(&game_root).await;
-        tx_notify_ui.send(PeerEvent::DownloadGameFilesFailed {
-            id: game_id.to_string(),
-        })?;
         return Err(err);
     }
     log::info!("all files downloaded for game: {game_id}");
-    tx_notify_ui.send(PeerEvent::DownloadGameFilesFinished {
-        id: game_id.to_string(),
-    })?;
     Ok(())
 }
 

crates/lanspread-peer/src/download/planning.rs

@@ -1,9 +1,8 @@
 use std::{collections::HashMap, net::SocketAddr};
 
 use lanspread_db::db::GameFileDescription;
-use tokio::sync::mpsc::UnboundedSender;
 
-use crate::{PeerEvent, config::CHUNK_SIZE};
+use crate::config::CHUNK_SIZE;
 
 /// Represents a chunk of a file to be downloaded.
 #[derive(Debug, Clone)]
@@ -34,7 +33,6 @@ pub(super) struct ChunkDownloadResult {
 pub(super) fn extract_version_descriptor(
     game_id: &str,
     game_file_descs: Vec<GameFileDescription>,
-    tx_notify_ui: &UnboundedSender<PeerEvent>,
 ) -> eyre::Result<(GameFileDescription, Vec<GameFileDescription>)> {
     let mut version_descs = Vec::new();
     let mut transfer_descs = Vec::new();
@@ -47,9 +45,6 @@ pub(super) fn extract_version_descriptor(
     }
 
     if version_descs.len() != 1 {
-        let _ = tx_notify_ui.send(PeerEvent::DownloadGameFilesFailed {
-            id: game_id.to_string(),
-        });
         eyre::bail!(
             "expected exactly one root-level version.ini sentinel for {game_id}, found {}",
             version_descs.len()
@@ -296,7 +291,6 @@ mod tests {
 
     #[test]
     fn version_descriptor_extraction_keeps_nested_decoy_in_transfer_list() {
-        let (tx, _rx) = tokio::sync::mpsc::unbounded_channel();
         let nested_decoy = vec![
             GameFileDescription {
                 game_id: "game".to_string(),
@@ -313,26 +307,24 @@ mod tests {
         ];
 
         let (version, transfer) =
-            extract_version_descriptor("game", nested_decoy, &tx).expect("only one root sentinel");
+            extract_version_descriptor("game", nested_decoy).expect("only one root sentinel");
         assert_eq!(version.relative_path, "game/version.ini");
         assert_eq!(transfer.len(), 2);
     }
 
     #[test]
     fn version_descriptor_extraction_requires_a_root_version_ini() {
-        let (tx, _rx) = tokio::sync::mpsc::unbounded_channel();
         let missing = vec![GameFileDescription {
             game_id: "game".to_string(),
             relative_path: "game/archive.eti".to_string(),
             is_dir: false,
             size: 1,
         }];
-        assert!(extract_version_descriptor("game", missing, &tx).is_err());
+        assert!(extract_version_descriptor("game", missing).is_err());
     }
 
     #[test]
     fn version_descriptor_extraction_rejects_duplicate_root_version_ini() {
-        let (tx, _rx) = tokio::sync::mpsc::unbounded_channel();
         let multiple = vec![
             GameFileDescription {
                 game_id: "game".to_string(),
@@ -347,6 +339,6 @@ mod tests {
                 size: 8,
             },
         ];
-        assert!(extract_version_descriptor("game", multiple, &tx).is_err());
+        assert!(extract_version_descriptor("game", multiple).is_err());
     }
 }

crates/lanspread-peer/src/download/storage.rs

@@ -5,8 +5,6 @@ use tokio::fs::OpenOptions;
 
 use crate::{local_games::is_local_dir_name, path_validation::validate_game_file_path};
 
-const INTENT_LOG_FILE: &str = ".lanspread.json";
-const SOFTLAN_INSTALL_MARKER: &str = ".softlan_game_installed";
 const SYNC_DIR: &str = ".sync";
 
 /// Prepares storage for game files by creating directories and pre-allocating files.
@@ -99,11 +97,7 @@ pub(super) async fn discard_cancelled_download(
 }
 
 fn should_preserve_on_download_discard(name: &str) -> bool {
-    is_local_dir_name(name)
-        || name.starts_with(".local.")
-        || name == INTENT_LOG_FILE
-        || name == SOFTLAN_INSTALL_MARKER
-        || name == SYNC_DIR
+    is_local_dir_name(name) || name.starts_with(".local.") || name == SYNC_DIR
 }
 
 async fn remove_entry(path: &Path) -> eyre::Result<()> {
@@ -207,7 +201,6 @@ mod tests {
         write_file(&root.join("version.ini"), b"20250101");
         write_file(&root.join("archive.eti"), b"partial");
         write_file(&root.join("local").join("save.dat"), b"user-data");
-        write_file(&root.join(".lanspread.json"), b"{\"intent\":\"None\"}");
         write_file(&root.join(".local.backup").join(".lanspread_owned"), b"");
 
         discard_cancelled_download(temp.path(), "game")
@@ -221,7 +214,6 @@ mod tests {
                 .expect("local install should remain"),
             b"user-data"
         );
-        assert!(root.join(".lanspread.json").is_file());
         assert!(root.join(".local.backup").is_dir());
     }
 }

crates/lanspread-peer/src/handlers.rs

@@ -199,6 +199,7 @@ pub async fn handle_download_game_files_command(
     id: String,
     file_descriptions: Vec<GameFileDescription>,
     install_after_download: bool,
+    account_name: Option<String>,
 ) {
     log::info!("Got PeerCommand::DownloadGameFiles");
     if !catalog_contains(ctx, &id).await {
@@ -276,7 +277,7 @@ pub async fn handle_download_game_files_command(
                 log::error!("Failed to send DownloadGameFilesFinished event: {e}");
             }
             if install_after_download {
-                spawn_install_operation(ctx, tx_notify_ui, id.clone());
+                spawn_install_operation(ctx, tx_notify_ui, id.clone(), account_name);
             }
         } else {
             log::error!("No trusted peers available after majority validation for game {id}");
@@ -321,7 +322,7 @@ pub async fn handle_download_game_files_command(
             peer_whitelist,
             file_peer_map,
             tx_notify_ui_clone.clone(),
-            cancel_token,
+            cancel_token.clone(),
         )
         .await;
 
@@ -341,6 +342,7 @@ pub async fn handle_download_game_files_command(
                     }
                     end_download_operation(&ctx_clone, &tx_notify_ui_clone, &download_id).await;
                     download_state_guard.disarm();
+                    send_download_finished(&tx_notify_ui_clone, &download_id);
                     return;
                 };
 
@@ -354,15 +356,20 @@ pub async fn handle_download_game_files_command(
                     .await
                     {
                         clear_active_download(&ctx_clone, &download_id).await;
+                        send_download_finished(&tx_notify_ui_clone, &download_id);
+                        download_state_guard.disarm();
                         run_started_install_operation(
                             &ctx_clone,
                             &tx_notify_ui_clone,
                             download_id,
                             prepared,
+                            account_name,
                         )
                         .await;
                     } else {
-                        clear_active_download(&ctx_clone, &download_id).await;
+                        end_download_operation(&ctx_clone, &tx_notify_ui_clone, &download_id).await;
+                        download_state_guard.disarm();
+                        send_download_finished(&tx_notify_ui_clone, &download_id);
                     }
                 } else {
                     if let Err(err) = refresh_local_game_for_ending_operation(
@@ -375,8 +382,9 @@ pub async fn handle_download_game_files_command(
                         log::error!("Failed to refresh local library after download: {err}");
                     }
                     end_download_operation(&ctx_clone, &tx_notify_ui_clone, &download_id).await;
+                    download_state_guard.disarm();
+                    send_download_finished(&tx_notify_ui_clone, &download_id);
                 }
-                download_state_guard.disarm();
             }
             Err(e) => {
                 if let Err(refresh_err) = refresh_local_game_for_ending_operation(
@@ -392,7 +400,17 @@ pub async fn handle_download_game_files_command(
                 }
                 end_download_operation(&ctx_clone, &tx_notify_ui_clone, &download_id).await;
                 download_state_guard.disarm();
-                log::error!("Download failed for {download_id}: {e}");
+                let download_was_cancelled = cancel_token.is_cancelled();
+                if download_was_cancelled {
+                    log::info!("Download cancelled for {download_id}: {e}");
+                } else {
+                    log::error!("Download failed for {download_id}: {e}");
+                }
+                send_download_failed_unless_cancelled(
+                    &tx_notify_ui_clone,
+                    &download_id,
+                    download_was_cancelled,
+                );
             }
         }
     });
@@ -403,8 +421,9 @@ pub async fn handle_install_game_command(
     ctx: &Ctx,
     tx_notify_ui: &UnboundedSender<PeerEvent>,
     id: String,
+    account_name: Option<String>,
 ) {
-    spawn_install_operation(ctx, tx_notify_ui, id);
+    spawn_install_operation(ctx, tx_notify_ui, id, account_name);
 }
 
 /// Handles the `UninstallGame` command.
@@ -447,15 +466,25 @@ pub async fn handle_cancel_download_command(
     cancel_token.cancel();
 }
 
-fn spawn_install_operation(ctx: &Ctx, tx_notify_ui: &UnboundedSender<PeerEvent>, id: String) {
+fn spawn_install_operation(
+    ctx: &Ctx,
+    tx_notify_ui: &UnboundedSender<PeerEvent>,
+    id: String,
+    account_name: Option<String>,
+) {
     let ctx = ctx.clone();
     let tx_notify_ui = tx_notify_ui.clone();
     ctx.task_tracker.clone().spawn(async move {
-        run_install_operation(&ctx, &tx_notify_ui, id).await;
+        run_install_operation(&ctx, &tx_notify_ui, id, account_name).await;
     });
 }
 
-async fn run_install_operation(ctx: &Ctx, tx_notify_ui: &UnboundedSender<PeerEvent>, id: String) {
+async fn run_install_operation(
+    ctx: &Ctx,
+    tx_notify_ui: &UnboundedSender<PeerEvent>,
+    id: String,
+    account_name: Option<String>,
+) {
     let Some(prepared) = prepare_install_operation(ctx, tx_notify_ui, &id).await else {
         return;
     };
@@ -465,7 +494,7 @@ async fn run_install_operation(ctx: &Ctx, tx_notify_ui: &UnboundedSender<PeerEve
         return;
     }
 
-    run_started_install_operation(ctx, tx_notify_ui, id, prepared).await;
+    run_started_install_operation(ctx, tx_notify_ui, id, prepared, account_name).await;
 }
 
 struct PreparedInstallOperation {
@@ -517,6 +546,7 @@ async fn run_started_install_operation(
     tx_notify_ui: &UnboundedSender<PeerEvent>,
     id: String,
     prepared: PreparedInstallOperation,
+    account_name: Option<String>,
 ) {
     let PreparedInstallOperation {
         game_root,
@@ -538,12 +568,27 @@ async fn run_started_install_operation(
             },
         );
 
+        let state_dir = ctx.state_dir.as_ref();
         match operation {
             InstallOperation::Installing => {
-                install::install(&game_root, &id, ctx.unpacker.clone()).await
+                install::install(
+                    &game_root,
+                    state_dir,
+                    &id,
+                    ctx.unpacker.clone(),
+                    account_name.as_deref(),
+                )
+                .await
             }
             InstallOperation::Updating => {
-                install::update(&game_root, &id, ctx.unpacker.clone()).await
+                install::update(
+                    &game_root,
+                    state_dir,
+                    &id,
+                    ctx.unpacker.clone(),
+                    account_name.as_deref(),
+                )
+                .await
             }
         }
     };
@@ -601,7 +646,7 @@ async fn run_uninstall_operation(ctx: &Ctx, tx_notify_ui: &UnboundedSender<PeerE
             PeerEvent::UninstallGameBegin { id: id.clone() },
         );
 
-        install::uninstall(&game_root, &id).await
+        install::uninstall(&game_root, ctx.state_dir.as_ref(), &id).await
     };
 
     match result {
@@ -767,6 +812,31 @@ async fn clear_active_download(ctx: &Ctx, id: &str) {
     ctx.active_downloads.write().await.remove(id);
 }
 
+fn send_download_finished(tx_notify_ui: &UnboundedSender<PeerEvent>, id: &str) {
+    if let Err(err) = tx_notify_ui.send(PeerEvent::DownloadGameFilesFinished { id: id.into() }) {
+        log::error!("Failed to send DownloadGameFilesFinished event: {err}");
+    }
+}
+
+fn send_download_failed(tx_notify_ui: &UnboundedSender<PeerEvent>, id: &str) {
+    if let Err(err) = tx_notify_ui.send(PeerEvent::DownloadGameFilesFailed { id: id.into() }) {
+        log::error!("Failed to send DownloadGameFilesFailed event: {err}");
+    }
+}
+
+fn send_download_failed_unless_cancelled(
+    tx_notify_ui: &UnboundedSender<PeerEvent>,
+    id: &str,
+    cancelled: bool,
+) -> bool {
+    if cancelled {
+        return false;
+    }
+
+    send_download_failed(tx_notify_ui, id);
+    true
+}
+
 async fn end_download_operation(ctx: &Ctx, tx_notify_ui: &UnboundedSender<PeerEvent>, id: &str) {
     end_operation(ctx, tx_notify_ui, id).await;
     clear_active_download(ctx, id).await;
@@ -845,7 +915,7 @@ async fn load_local_library_with_policy(
 ) -> eyre::Result<()> {
     let game_dir = { ctx.game_dir.read().await.clone() };
     let active_ids = active_operation_ids(ctx).await;
-    install::recover_on_startup(&game_dir, &active_ids).await?;
+    install::recover_on_startup(&game_dir, ctx.state_dir.as_ref(), &active_ids).await?;
     scan_and_announce_local_library(ctx, tx_notify_ui, &game_dir, event_policy).await
 }
 
@@ -870,7 +940,7 @@ async fn scan_and_announce_local_library(
     event_policy: LocalLibraryEventPolicy,
 ) -> eyre::Result<()> {
     let catalog = ctx.catalog.read().await.clone();
-    let scan = scan_local_library(game_dir, &catalog).await?;
+    let scan = scan_local_library(game_dir, ctx.state_dir.as_ref(), &catalog).await?;
     update_and_announce_games_with_policy(ctx, tx_notify_ui, scan, event_policy, None).await;
     Ok(())
 }
@@ -884,7 +954,7 @@ async fn refresh_local_game_for_ending_operation(
 ) -> eyre::Result<()> {
     let game_dir = { ctx.game_dir.read().await.clone() };
     let catalog = ctx.catalog.read().await.clone();
-    let scan = rescan_local_game(&game_dir, &catalog, id).await?;
+    let scan = rescan_local_game(&game_dir, ctx.state_dir.as_ref(), &catalog, id).await?;
     update_and_announce_games_with_policy(
         ctx,
         tx_notify_ui,
@@ -1068,7 +1138,8 @@ mod tests {
         Ctx::new(
             Arc::new(RwLock::new(PeerGameDB::new())),
             "peer".to_string(),
-            game_dir,
+            game_dir.clone(),
+            game_dir.join(".test-state"),
             Arc::new(FakeUnpacker),
             CancellationToken::new(),
             TaskTracker::new(),
@@ -1076,6 +1147,29 @@ mod tests {
         )
     }
 
+    #[test]
+    fn cancelled_download_error_does_not_emit_failed_event() {
+        let (tx, mut rx) = mpsc::unbounded_channel();
+
+        let emitted = send_download_failed_unless_cancelled(&tx, "game", true);
+
+        assert!(!emitted);
+        assert!(rx.try_recv().is_err());
+    }
+
+    #[test]
+    fn uncancelled_download_error_emits_failed_event() {
+        let (tx, mut rx) = mpsc::unbounded_channel();
+
+        let emitted = send_download_failed_unless_cancelled(&tx, "game", false);
+
+        assert!(emitted);
+        assert!(matches!(
+            rx.try_recv(),
+            Ok(PeerEvent::DownloadGameFilesFailed { id }) if id == "game"
+        ));
+    }
+
     async fn recv_event(rx: &mut mpsc::UnboundedReceiver<PeerEvent>) -> PeerEvent {
         tokio::time::timeout(Duration::from_secs(1), rx.recv())
             .await
@@ -1332,7 +1426,7 @@ mod tests {
             .insert("game".to_string(), OperationKind::Installing);
         let (tx, mut rx) = mpsc::unbounded_channel();
         let catalog = ctx.catalog.read().await.clone();
-        let scan = scan_local_library(temp.path(), &catalog)
+        let scan = scan_local_library(temp.path(), ctx.state_dir.as_ref(), &catalog)
             .await
             .expect("scan should succeed");
 
@@ -1378,13 +1472,13 @@ mod tests {
         let (tx, mut rx) = mpsc::unbounded_channel();
         let catalog = ctx.catalog.read().await.clone();
 
-        let scan = scan_local_library(temp.path(), &catalog)
+        let scan = scan_local_library(temp.path(), ctx.state_dir.as_ref(), &catalog)
             .await
             .expect("first scan should succeed");
         update_and_announce_games(&ctx, &tx, scan).await;
         assert_local_update(recv_event(&mut rx).await, false, true);
 
-        let scan = scan_local_library(temp.path(), &catalog)
+        let scan = scan_local_library(temp.path(), ctx.state_dir.as_ref(), &catalog)
             .await
             .expect("second scan should succeed");
         update_and_announce_games(&ctx, &tx, scan).await;
@@ -1403,13 +1497,13 @@ mod tests {
         let ctx = test_ctx(temp.path().to_path_buf());
         let (tx, mut rx) = mpsc::unbounded_channel();
         let catalog = ctx.catalog.read().await.clone();
-        let scan = scan_local_library(temp.path(), &catalog)
+        let scan = scan_local_library(temp.path(), ctx.state_dir.as_ref(), &catalog)
             .await
             .expect("initial scan should succeed");
         update_and_announce_games(&ctx, &tx, scan).await;
         assert_local_update(recv_event(&mut rx).await, true, true);
 
-        run_install_operation(&ctx, &tx, "game".to_string()).await;
+        run_install_operation(&ctx, &tx, "game".to_string(), None).await;
 
         assert_active_update(
             recv_event(&mut rx).await,
@@ -1440,7 +1534,7 @@ mod tests {
         let ctx = test_ctx(temp.path().to_path_buf());
         let (tx, mut rx) = mpsc::unbounded_channel();
 
-        run_install_operation(&ctx, &tx, "game".to_string()).await;
+        run_install_operation(&ctx, &tx, "game".to_string(), None).await;
 
         assert_active_update(
             recv_event(&mut rx).await,
@@ -1494,7 +1588,7 @@ mod tests {
                         .await
                 );
                 clear_active_download(&ctx, "game").await;
-                run_started_install_operation(&ctx, &tx, "game".to_string(), prepared).await;
+                run_started_install_operation(&ctx, &tx, "game".to_string(), prepared, None).await;
             }
         });
 
@@ -1561,7 +1655,7 @@ mod tests {
         let ctx = test_ctx(temp.path().to_path_buf());
         let (tx, mut rx) = mpsc::unbounded_channel();
 
-        run_install_operation(&ctx, &tx, "game".to_string()).await;
+        run_install_operation(&ctx, &tx, "game".to_string(), None).await;
 
         assert_active_update(
             recv_event(&mut rx).await,
@@ -1593,7 +1687,7 @@ mod tests {
         let ctx = test_ctx(temp.path().to_path_buf());
         let (tx, mut rx) = mpsc::unbounded_channel();
 
-        run_install_operation(&ctx, &tx, "game".to_string()).await;
+        run_install_operation(&ctx, &tx, "game".to_string(), None).await;
         assert_active_update(
             recv_event(&mut rx).await,
             active_update("game", ActiveOperationKind::Installing),
@@ -1616,7 +1710,7 @@ mod tests {
         write_file(&root.join("version.ini"), b"20250101");
         write_file(&root.join("game.eti"), b"new archive");
 
-        run_install_operation(&ctx, &tx, "game".to_string()).await;
+        run_install_operation(&ctx, &tx, "game".to_string(), None).await;
         assert_active_update(
             recv_event(&mut rx).await,
             active_update("game", ActiveOperationKind::Updating),
@@ -1695,7 +1789,7 @@ mod tests {
         let ctx = test_ctx(temp.path().to_path_buf());
         let (tx, mut rx) = mpsc::unbounded_channel();
         let catalog = ctx.catalog.read().await.clone();
-        let scan = scan_local_library(temp.path(), &catalog)
+        let scan = scan_local_library(temp.path(), ctx.state_dir.as_ref(), &catalog)
             .await
             .expect("initial scan should succeed");
         update_and_announce_games(&ctx, &tx, scan).await;
@@ -1781,7 +1875,7 @@ mod tests {
         let ctx = test_ctx(current.path().to_path_buf());
         let (tx, mut rx) = mpsc::unbounded_channel();
         let catalog = ctx.catalog.read().await.clone();
-        let scan = scan_local_library(current.path(), &catalog)
+        let scan = scan_local_library(current.path(), ctx.state_dir.as_ref(), &catalog)
             .await
             .expect("initial scan should succeed");
         update_and_announce_games(&ctx, &tx, scan).await;

crates/lanspread-peer/src/identity.rs

@@ -1,13 +1,13 @@
-use std::path::{Path, PathBuf};
+use std::path::Path;
 
 use uuid::Uuid;
 
-const PEER_ID_FILE: &str = "peer_id";
+use crate::state_paths::peer_id_path;
 
 pub const FEATURE_LIBRARY_DELTA: &str = "library-delta-v1";
 pub const FEATURE_LIBRARY_SNAPSHOT: &str = "library-snapshot-v1";
 
-pub fn load_or_create_peer_id(state_dir: Option<&Path>) -> eyre::Result<String> {
+pub fn load_or_create_peer_id(state_dir: &Path) -> eyre::Result<String> {
     let path = peer_id_path(state_dir);
     if let Ok(existing) = std::fs::read_to_string(&path) {
         let trimmed = existing.trim();
@@ -30,19 +30,3 @@ pub fn default_features() -> Vec<String> {
         FEATURE_LIBRARY_SNAPSHOT.to_string(),
     ]
 }
-
-fn peer_id_path(state_dir: Option<&Path>) -> PathBuf {
-    if let Some(dir) = state_dir {
-        return dir.join(PEER_ID_FILE);
-    }
-
-    if let Some(dir) = std::env::var_os("LANSPREAD_STATE_DIR") {
-        return PathBuf::from(dir).join(PEER_ID_FILE);
-    }
-
-    if let Some(home) = std::env::var_os("HOME").or_else(|| std::env::var_os("USERPROFILE")) {
-        return PathBuf::from(home).join(".lanspread").join(PEER_ID_FILE);
-    }
-
-    std::env::temp_dir().join("lanspread").join(PEER_ID_FILE)
-}

crates/lanspread-peer/src/install/intent.rs

@@ -7,8 +7,10 @@ use serde::{Deserialize, Serialize};
 use tokio::io::AsyncWriteExt;
 
 const INTENT_SCHEMA_VERSION: u32 = 1;
-const INTENT_FILE: &str = ".lanspread.json";
-const INTENT_TMP_FILE: &str = ".lanspread.json.tmp";
+pub(crate) const LEGACY_INTENT_FILE: &str = ".lanspread.json";
+pub(crate) const LEGACY_INTENT_TMP_FILE: &str = ".lanspread.json.tmp";
+const INTENT_FILE: &str = "install_intent.json";
+const INTENT_TMP_FILE: &str = "install_intent.json.tmp";
 
 #[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
 pub enum InstallIntentState {
@@ -41,18 +43,22 @@ impl InstallIntent {
     pub fn none(id: &str, eti_version: Option<String>) -> Self {
         Self::new(id, InstallIntentState::None, eti_version)
     }
+
+    pub fn is_current_for(&self, id: &str) -> bool {
+        self.schema_version == INTENT_SCHEMA_VERSION && self.id == id
+    }
 }
 
-pub fn intent_path(game_root: &Path) -> PathBuf {
-    game_root.join(INTENT_FILE)
+pub fn intent_path(state_dir: &Path, id: &str) -> PathBuf {
+    crate::state_paths::game_state_dir(state_dir, id).join(INTENT_FILE)
 }
 
-pub fn intent_tmp_path(game_root: &Path) -> PathBuf {
-    game_root.join(INTENT_TMP_FILE)
+pub fn intent_tmp_path(state_dir: &Path, id: &str) -> PathBuf {
+    crate::state_paths::game_state_dir(state_dir, id).join(INTENT_TMP_FILE)
 }
 
-pub async fn read_intent(game_root: &Path, id: &str) -> InstallIntent {
-    let path = intent_path(game_root);
+pub async fn read_intent(state_dir: &Path, id: &str) -> InstallIntent {
+    let path = intent_path(state_dir, id);
     let data = match tokio::fs::read_to_string(&path).await {
         Ok(data) => data,
         Err(err) => {
@@ -64,7 +70,7 @@ pub async fn read_intent(game_root: &Path, id: &str) -> InstallIntent {
     };
 
     match serde_json::from_str::<InstallIntent>(&data) {
-        Ok(intent) if intent.schema_version == INTENT_SCHEMA_VERSION && intent.id == id => intent,
+        Ok(intent) if intent.is_current_for(id) => intent,
         Ok(intent) => {
             log::warn!(
                 "Ignoring install intent {} with schema {} for id {}",
@@ -81,10 +87,11 @@ pub async fn read_intent(game_root: &Path, id: &str) -> InstallIntent {
     }
 }
 
-pub async fn write_intent(game_root: &Path, intent: &InstallIntent) -> eyre::Result<()> {
-    tokio::fs::create_dir_all(game_root).await?;
-    let path = intent_path(game_root);
-    let tmp_path = intent_tmp_path(game_root);
+pub async fn write_intent(state_dir: &Path, id: &str, intent: &InstallIntent) -> eyre::Result<()> {
+    let game_state_dir = crate::state_paths::game_state_dir(state_dir, id);
+    tokio::fs::create_dir_all(&game_state_dir).await?;
+    let path = intent_path(state_dir, id);
+    let tmp_path = intent_tmp_path(state_dir, id);
     let data = serde_json::to_vec_pretty(intent)?;
 
     let mut file = tokio::fs::File::create(&tmp_path).await?;
@@ -122,6 +129,18 @@ mod tests {
     use super::*;
     use crate::test_support::TempDir;
 
+    async fn write_raw_intent(state_dir: &Path, id: &str, bytes: impl AsRef<[u8]>) {
+        let path = intent_path(state_dir, id);
+        if let Some(parent) = path.parent() {
+            tokio::fs::create_dir_all(parent)
+                .await
+                .expect("intent parent should be created");
+        }
+        tokio::fs::write(path, bytes)
+            .await
+            .expect("intent should be written");
+    }
+
     #[tokio::test]
     async fn tmp_write_without_rename_leaves_previous_intent_intact() {
         let temp = TempDir::new("lanspread-intent");
@@ -130,12 +149,12 @@ mod tests {
             InstallIntentState::Updating,
             Some("20240101".to_string()),
         );
-        write_intent(temp.path(), &previous)
+        write_intent(temp.path(), "game", &previous)
             .await
             .expect("previous intent should be written");
 
         tokio::fs::write(
-            intent_tmp_path(temp.path()),
+            intent_tmp_path(temp.path(), "game"),
             serde_json::to_vec(&InstallIntent::new(
                 "game",
                 InstallIntentState::Installing,
@@ -154,12 +173,12 @@ mod tests {
     #[tokio::test]
     async fn schema_mismatch_is_treated_as_missing() {
         let temp = TempDir::new("lanspread-intent");
-        tokio::fs::write(
-            intent_path(temp.path()),
+        write_raw_intent(
+            temp.path(),
+            "game",
             r#"{"schema_version":2,"id":"game","recorded_at":0,"state":"Updating"}"#,
         )
-        .await
-        .expect("intent should be written");
+        .await;
 
         let recovered = read_intent(temp.path(), "game").await;
         assert_eq!(recovered.state, InstallIntentState::None);
@@ -168,12 +187,12 @@ mod tests {
     #[tokio::test]
     async fn mismatched_id_is_treated_as_missing() {
         let temp = TempDir::new("lanspread-intent");
-        tokio::fs::write(
-            intent_path(temp.path()),
+        write_raw_intent(
+            temp.path(),
+            "game",
             r#"{"schema_version":1,"id":"other","recorded_at":0,"state":"Updating"}"#,
         )
-        .await
-        .expect("intent should be written");
+        .await;
 
         let recovered = read_intent(temp.path(), "game").await;
         assert_eq!(recovered.state, InstallIntentState::None);
@@ -182,9 +201,7 @@ mod tests {
     #[tokio::test]
     async fn corrupt_intent_is_treated_as_missing() {
         let temp = TempDir::new("lanspread-intent");
-        tokio::fs::write(intent_path(temp.path()), b"not json")
-            .await
-            .expect("intent should be written");
+        write_raw_intent(temp.path(), "game", b"not json").await;
 
         let recovered = read_intent(temp.path(), "game").await;
         assert_eq!(recovered.state, InstallIntentState::None);
@@ -193,21 +210,21 @@ mod tests {
     #[tokio::test]
     async fn old_manifest_hash_field_is_ignored_and_new_writes_omit_it() {
         let temp = TempDir::new("lanspread-intent");
-        tokio::fs::write(
-            intent_path(temp.path()),
+        write_raw_intent(
+            temp.path(),
+            "game",
             r#"{"schema_version":1,"id":"game","recorded_at":0,"state":"Updating","eti_version":"20240101","manifest_hash":42}"#,
         )
-        .await
-        .expect("intent should be written");
+        .await;
 
         let recovered = read_intent(temp.path(), "game").await;
         assert_eq!(recovered.state, InstallIntentState::Updating);
         assert_eq!(recovered.eti_version.as_deref(), Some("20240101"));
 
-        write_intent(temp.path(), &InstallIntent::none("game", None))
+        write_intent(temp.path(), "game", &InstallIntent::none("game", None))
             .await
             .expect("intent should be written");
-        let written = tokio::fs::read_to_string(intent_path(temp.path()))
+        let written = tokio::fs::read_to_string(intent_path(temp.path(), "game"))
             .await
             .expect("intent should be readable");
         assert!(

crates/lanspread-peer/src/install/mod.rs

@@ -1,4 +1,4 @@
-mod intent;
+pub(crate) mod intent;
 mod remove;
 mod transaction;
 pub mod unpack;

crates/lanspread-peer/src/install/transaction.rs

@@ -1,5 +1,6 @@
 use std::{
     collections::HashSet,
+    ffi::OsStr,
     io::ErrorKind,
     path::{Path, PathBuf},
     sync::Arc,
@@ -19,6 +20,7 @@ const BACKUP_DIR: &str = ".local.backup";
 const OWNED_MARKER: &str = ".lanspread_owned";
 const VERSION_TMP_FILE: &str = ".version.ini.tmp";
 const VERSION_DISCARDED_FILE: &str = ".version.ini.discarded";
+const ACCOUNT_NAME_FILE: &str = "account_name.txt";
 
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 enum FsEntryState {
@@ -33,18 +35,25 @@ struct InstallFsState {
     backup: FsEntryState,
 }
 
-pub async fn install(game_root: &Path, id: &str, unpacker: Arc<dyn Unpacker>) -> eyre::Result<()> {
+pub async fn install(
+    game_root: &Path,
+    state_dir: &Path,
+    id: &str,
+    unpacker: Arc<dyn Unpacker>,
+    account_name: Option<&str>,
+) -> eyre::Result<()> {
     let eti_version = read_downloaded_version(game_root).await;
     write_intent(
-        game_root,
+        state_dir,
+        id,
         &InstallIntent::new(id, InstallIntentState::Installing, eti_version.clone()),
     )
     .await?;
 
-    let result = install_inner(game_root, id, unpacker).await;
+    let result = install_inner(game_root, id, unpacker, account_name).await;
     match result {
         Ok(()) => {
-            write_intent(game_root, &InstallIntent::none(id, eti_version)).await?;
+            write_intent(state_dir, id, &InstallIntent::none(id, eti_version)).await?;
             Ok(())
         }
         Err(err) => {
@@ -54,24 +63,31 @@ pub async fn install(game_root: &Path, id: &str, unpacker: Arc<dyn Unpacker>) ->
                     installing_dir(game_root).display()
                 );
             }
-            write_intent(game_root, &InstallIntent::none(id, eti_version)).await?;
+            write_intent(state_dir, id, &InstallIntent::none(id, eti_version)).await?;
             Err(err)
         }
     }
 }
 
-pub async fn update(game_root: &Path, id: &str, unpacker: Arc<dyn Unpacker>) -> eyre::Result<()> {
+pub async fn update(
+    game_root: &Path,
+    state_dir: &Path,
+    id: &str,
+    unpacker: Arc<dyn Unpacker>,
+    account_name: Option<&str>,
+) -> eyre::Result<()> {
     let eti_version = read_downloaded_version(game_root).await;
     write_intent(
-        game_root,
+        state_dir,
+        id,
         &InstallIntent::new(id, InstallIntentState::Updating, eti_version.clone()),
     )
     .await?;
 
-    let result = update_inner(game_root, id, unpacker).await;
+    let result = update_inner(game_root, id, unpacker, account_name).await;
     match result {
         Ok(()) => {
-            write_intent(game_root, &InstallIntent::none(id, eti_version)).await?;
+            write_intent(state_dir, id, &InstallIntent::none(id, eti_version)).await?;
             if let Err(err) = remove_dir_all_if_exists(&backup_dir(game_root)).await {
                 log::warn!(
                     "Failed to clean install backup {}: {err}",
@@ -82,7 +98,7 @@ pub async fn update(game_root: &Path, id: &str, unpacker: Arc<dyn Unpacker>) ->
         }
         Err(err) => {
             let rollback = rollback_update(game_root).await;
-            write_intent(game_root, &InstallIntent::none(id, eti_version)).await?;
+            write_intent(state_dir, id, &InstallIntent::none(id, eti_version)).await?;
             if let Err(rollback_err) = rollback {
                 return Err(err.wrap_err(format!("rollback also failed: {rollback_err}")));
             }
@@ -91,10 +107,11 @@ pub async fn update(game_root: &Path, id: &str, unpacker: Arc<dyn Unpacker>) ->
     }
 }
 
-pub async fn uninstall(game_root: &Path, id: &str) -> eyre::Result<()> {
+pub async fn uninstall(game_root: &Path, state_dir: &Path, id: &str) -> eyre::Result<()> {
     let eti_version = read_downloaded_version(game_root).await;
     write_intent(
-        game_root,
+        state_dir,
+        id,
         &InstallIntent::new(id, InstallIntentState::Uninstalling, eti_version.clone()),
     )
     .await?;
@@ -102,7 +119,7 @@ pub async fn uninstall(game_root: &Path, id: &str) -> eyre::Result<()> {
     let result = uninstall_inner(game_root).await;
     match result {
         Ok(()) => {
-            write_intent(game_root, &InstallIntent::none(id, eti_version)).await?;
+            write_intent(state_dir, id, &InstallIntent::none(id, eti_version)).await?;
             Ok(())
         }
         Err(err) => {
@@ -110,13 +127,17 @@ pub async fn uninstall(game_root: &Path, id: &str) -> eyre::Result<()> {
             if let Err(rollback_err) = rollback {
                 return Err(err.wrap_err(format!("rollback also failed: {rollback_err}")));
             }
-            write_intent(game_root, &InstallIntent::none(id, eti_version)).await?;
+            write_intent(state_dir, id, &InstallIntent::none(id, eti_version)).await?;
             Err(err)
         }
     }
 }
 
-pub async fn recover_on_startup(game_dir: &Path, active_ids: &HashSet<String>) -> eyre::Result<()> {
+pub async fn recover_on_startup(
+    game_dir: &Path,
+    state_dir: &Path,
+    active_ids: &HashSet<String>,
+) -> eyre::Result<()> {
     recover_download_transients(game_dir).await?;
 
     let mut entries = match tokio::fs::read_dir(game_dir).await {
@@ -141,22 +162,28 @@ pub async fn recover_on_startup(game_dir: &Path, active_ids: &HashSet<String>) -
             continue;
         }
 
-        recover_game_root(&entry.path(), &id).await?;
+        recover_game_root(&entry.path(), state_dir, &id).await?;
     }
 
     Ok(())
 }
 
-pub async fn recover_game_root(game_root: &Path, id: &str) -> eyre::Result<()> {
+pub async fn recover_game_root(game_root: &Path, state_dir: &Path, id: &str) -> eyre::Result<()> {
     recover_download_transients(game_root).await?;
 
-    let intent = read_intent(game_root, id).await;
+    let intent = read_intent(state_dir, id).await;
     let fs = inspect_install_fs(game_root).await;
     match intent.state {
         InstallIntentState::None => recover_none_intent(game_root).await?,
-        InstallIntentState::Installing => recover_installing(game_root, id, intent, fs).await?,
-        InstallIntentState::Updating => recover_updating(game_root, id, intent, fs).await?,
-        InstallIntentState::Uninstalling => recover_uninstalling(game_root, id, intent, fs).await?,
+        InstallIntentState::Installing => {
+            recover_installing(game_root, state_dir, id, intent, fs).await?;
+        }
+        InstallIntentState::Updating => {
+            recover_updating(game_root, state_dir, id, intent, fs).await?;
+        }
+        InstallIntentState::Uninstalling => {
+            recover_uninstalling(game_root, state_dir, id, intent, fs).await?;
+        }
     }
     Ok(())
 }
@@ -165,6 +192,7 @@ async fn install_inner(
     game_root: &Path,
     id: &str,
     unpacker: Arc<dyn Unpacker>,
+    account_name: Option<&str>,
 ) -> eyre::Result<()> {
     let local = local_dir(game_root);
     if path_is_dir(&local).await {
@@ -174,13 +202,19 @@ async fn install_inner(
     let staging = installing_dir(game_root);
     prepare_owned_empty_dir(&staging).await?;
     unpack_archives(game_root, &staging, unpacker).await?;
+    write_account_name_if_present(&staging, account_name).await?;
     tokio::fs::rename(&staging, &local)
         .await
         .wrap_err_with(|| format!("failed to promote install for {id}"))?;
     Ok(())
 }
 
-async fn update_inner(game_root: &Path, id: &str, unpacker: Arc<dyn Unpacker>) -> eyre::Result<()> {
+async fn update_inner(
+    game_root: &Path,
+    id: &str,
+    unpacker: Arc<dyn Unpacker>,
+    account_name: Option<&str>,
+) -> eyre::Result<()> {
     let local = local_dir(game_root);
     let backup = backup_dir(game_root);
     let staging = installing_dir(game_root);
@@ -196,6 +230,7 @@ async fn update_inner(game_root: &Path, id: &str, unpacker: Arc<dyn Unpacker>) -
 
     prepare_owned_empty_dir(&staging).await?;
     unpack_archives(game_root, &staging, unpacker).await?;
+    write_account_name_if_present(&staging, account_name).await?;
     tokio::fs::rename(&staging, &local)
         .await
         .wrap_err_with(|| format!("failed to promote update for {id}"))?;
@@ -249,6 +284,48 @@ async fn root_eti_archives(game_root: &Path) -> eyre::Result<Vec<PathBuf>> {
     Ok(archives)
 }
 
+async fn write_account_name_if_present(
+    install_root: &Path,
+    account_name: Option<&str>,
+) -> eyre::Result<()> {
+    let Some(account_name) = account_name else {
+        return Ok(());
+    };
+
+    let Some(path) = find_account_name_file(install_root).await? else {
+        return Ok(());
+    };
+
+    tokio::fs::write(&path, account_name)
+        .await
+        .wrap_err_with(|| format!("failed to write {}", path.display()))?;
+    Ok(())
+}
+
+async fn find_account_name_file(root: &Path) -> eyre::Result<Option<PathBuf>> {
+    let mut pending_dirs = vec![root.to_path_buf()];
+    while let Some(dir) = pending_dirs.pop() {
+        let mut entries = tokio::fs::read_dir(&dir).await?;
+        let mut child_dirs = Vec::new();
+        while let Some(entry) = entries.next_entry().await? {
+            let file_type = entry.file_type().await?;
+            let path = entry.path();
+            if entry.file_name() == OsStr::new(ACCOUNT_NAME_FILE) && file_type.is_file() {
+                return Ok(Some(path));
+            }
+            if file_type.is_dir() {
+                child_dirs.push(path);
+            }
+        }
+
+        child_dirs.sort();
+        child_dirs.reverse();
+        pending_dirs.extend(child_dirs);
+    }
+
+    Ok(None)
+}
+
 async fn recover_none_intent(game_root: &Path) -> eyre::Result<()> {
     sweep_owned_orphan(&installing_dir(game_root)).await?;
     sweep_owned_orphan(&backup_dir(game_root)).await?;
@@ -257,6 +334,7 @@ async fn recover_none_intent(game_root: &Path) -> eyre::Result<()> {
 
 async fn recover_installing(
     game_root: &Path,
+    state_dir: &Path,
     id: &str,
     intent: InstallIntent,
     fs: InstallFsState,
@@ -268,11 +346,12 @@ async fn recover_installing(
     {
         remove_dir_all_if_exists(&installing_dir(game_root)).await?;
     }
-    write_intent(game_root, &InstallIntent::none(id, intent.eti_version)).await
+    write_intent(state_dir, id, &InstallIntent::none(id, intent.eti_version)).await
 }
 
 async fn recover_updating(
     game_root: &Path,
+    state_dir: &Path,
     id: &str,
     intent: InstallIntent,
     fs: InstallFsState,
@@ -301,11 +380,12 @@ async fn recover_updating(
         } => remove_dir_all_if_exists(&backup_dir(game_root)).await?,
         _ => {}
     }
-    write_intent(game_root, &InstallIntent::none(id, intent.eti_version)).await
+    write_intent(state_dir, id, &InstallIntent::none(id, intent.eti_version)).await
 }
 
 async fn recover_uninstalling(
     game_root: &Path,
+    state_dir: &Path,
     id: &str,
     intent: InstallIntent,
     fs: InstallFsState,
@@ -323,7 +403,7 @@ async fn recover_uninstalling(
         } => uninstall_inner(game_root).await?,
         _ => {}
     }
-    write_intent(game_root, &InstallIntent::none(id, intent.eti_version)).await
+    write_intent(state_dir, id, &InstallIntent::none(id, intent.eti_version)).await
 }
 
 async fn recover_download_transients(root: &Path) -> eyre::Result<()> {
@@ -416,6 +496,10 @@ async fn restore_backup(game_root: &Path) -> eyre::Result<()> {
 }
 
 async fn remove_file_if_exists(path: &Path) -> eyre::Result<()> {
+    if !path_exists(path).await {
+        return Ok(());
+    }
+
     match tokio::fs::remove_file(path).await {
         Ok(()) => Ok(()),
         Err(err) if err.kind() == ErrorKind::NotFound => Ok(()),
@@ -437,6 +521,10 @@ async fn path_is_dir(path: &Path) -> bool {
         .is_ok_and(|metadata| metadata.is_dir())
 }
 
+async fn path_exists(path: &Path) -> bool {
+    tokio::fs::metadata(path).await.is_ok()
+}
+
 fn local_dir(game_root: &Path) -> PathBuf {
     game_root.join(LOCAL_DIR)
 }
@@ -530,33 +618,61 @@ mod tests {
         Arc::new(FakeUnpacker::default())
     }
 
+    fn test_state() -> TempDir {
+        TempDir::new("lanspread-install-state")
+    }
+
     #[tokio::test]
     async fn install_success_promotes_staging_and_clears_intent() {
         let temp = TempDir::new("lanspread-install");
+        let state = test_state();
         let root = temp.game_root();
         write_file(&root.join("game.eti"), b"archive");
         write_file(&root.join("version.ini"), b"20250101");
 
-        install(&root, "game", successful_unpacker())
+        install(&root, state.path(), "game", successful_unpacker(), None)
             .await
             .expect("install should succeed");
 
         assert!(root.join("local").join("payload.txt").is_file());
         assert!(!root.join(".local.installing").exists());
-        let intent = read_intent(&root, "game").await;
+        let intent = read_intent(state.path(), "game").await;
         assert_eq!(intent.state, InstallIntentState::None);
     }
 
+    #[tokio::test]
+    async fn install_account_name_missing_file_is_noop() {
+        let temp = TempDir::new("lanspread-install");
+        let state = test_state();
+        let root = temp.game_root();
+        write_file(&root.join("game.eti"), b"archive");
+        write_file(&root.join("version.ini"), b"20250101");
+
+        install(
+            &root,
+            state.path(),
+            "game",
+            successful_unpacker(),
+            Some("Alice"),
+        )
+        .await
+        .expect("install should succeed without account file");
+
+        assert!(root.join("local").join("payload.txt").is_file());
+        assert!(!root.join("local").join(ACCOUNT_NAME_FILE).exists());
+    }
+
     #[tokio::test]
     async fn install_unpacks_multiple_root_eti_archives_in_sorted_order() {
         let temp = TempDir::new("lanspread-install");
+        let state = test_state();
         let root = temp.game_root();
         write_file(&root.join("b.eti"), b"archive");
         write_file(&root.join("a.eti"), b"archive");
         write_file(&root.join("version.ini"), b"20250101");
         let unpacker = Arc::new(FakeUnpacker::default());
 
-        install(&root, "game", unpacker.clone())
+        install(&root, state.path(), "game", unpacker.clone(), None)
             .await
             .expect("install should succeed");
 
@@ -570,37 +686,95 @@ mod tests {
         assert_eq!(archives, vec!["a.eti", "b.eti"]);
     }
 
+    #[tokio::test]
+    async fn install_overwrites_first_account_name_file() {
+        struct AccountNameUnpacker;
+
+        impl Unpacker for AccountNameUnpacker {
+            fn unpack<'a>(&'a self, _archive: &'a Path, dest: &'a Path) -> UnpackFuture<'a> {
+                Box::pin(async move {
+                    tokio::fs::create_dir_all(dest.join("a")).await?;
+                    tokio::fs::create_dir_all(dest.join("z")).await?;
+                    tokio::fs::write(dest.join("a").join(ACCOUNT_NAME_FILE), b"old-a").await?;
+                    tokio::fs::write(dest.join("z").join(ACCOUNT_NAME_FILE), b"old-z").await?;
+                    Ok(())
+                })
+            }
+        }
+
+        let temp = TempDir::new("lanspread-install");
+        let state = test_state();
+        let root = temp.game_root();
+        write_file(&root.join("game.eti"), b"archive");
+        write_file(&root.join("version.ini"), b"20250101");
+
+        install(
+            &root,
+            state.path(),
+            "game",
+            Arc::new(AccountNameUnpacker),
+            Some("Alice"),
+        )
+        .await
+        .expect("install should succeed");
+
+        assert_eq!(
+            std::fs::read_to_string(root.join("local").join("a").join(ACCOUNT_NAME_FILE))
+                .expect("first account file should be readable"),
+            "Alice"
+        );
+        assert_eq!(
+            std::fs::read_to_string(root.join("local").join("z").join(ACCOUNT_NAME_FILE))
+                .expect("second account file should be readable"),
+            "old-z"
+        );
+    }
+
     #[tokio::test]
     async fn update_failure_restores_previous_local() {
         let temp = TempDir::new("lanspread-install");
+        let state = test_state();
         let root = temp.game_root();
         write_file(&root.join("game.eti"), b"archive");
         write_file(&root.join("version.ini"), b"20250101");
         write_file(&root.join("local").join("old.txt"), b"old");
 
-        let err = update(&root, "game", Arc::new(FakeUnpacker::failing()))
-            .await
-            .expect_err("update should fail");
+        let err = update(
+            &root,
+            state.path(),
+            "game",
+            Arc::new(FakeUnpacker::failing()),
+            None,
+        )
+        .await
+        .expect_err("update should fail");
 
         assert!(err.to_string().contains("forced unpack failure"));
         assert!(root.join("local").join("old.txt").is_file());
         assert!(!root.join(".local.installing").exists());
         assert!(!root.join(".local.backup").exists());
-        let intent = read_intent(&root, "game").await;
+        let intent = read_intent(state.path(), "game").await;
         assert_eq!(intent.state, InstallIntentState::None);
     }
 
     #[tokio::test]
     async fn update_commit_rename_failure_restores_previous_local() {
         let temp = TempDir::new("lanspread-install");
+        let state = test_state();
         let root = temp.game_root();
         write_file(&root.join("game.eti"), b"archive");
         write_file(&root.join("version.ini"), b"20250101");
         write_file(&root.join("local").join("old.txt"), b"old");
 
-        let err = update(&root, "game", Arc::new(FakeUnpacker::commit_conflict()))
-            .await
-            .expect_err("update should fail at commit rename");
+        let err = update(
+            &root,
+            state.path(),
+            "game",
+            Arc::new(FakeUnpacker::commit_conflict()),
+            None,
+        )
+        .await
+        .expect_err("update should fail at commit rename");
 
         assert!(
             err.to_string().contains("failed to promote update"),
@@ -614,19 +788,20 @@ mod tests {
         assert!(!root.join("local").join("conflict.txt").exists());
         assert!(!root.join(".local.installing").exists());
         assert!(!root.join(".local.backup").exists());
-        let intent = read_intent(&root, "game").await;
+        let intent = read_intent(state.path(), "game").await;
         assert_eq!(intent.state, InstallIntentState::None);
     }
 
     #[tokio::test]
     async fn update_success_promotes_new_local_and_removes_backup() {
         let temp = TempDir::new("lanspread-install");
+        let state = test_state();
         let root = temp.game_root();
         write_file(&root.join("game.eti"), b"archive");
         write_file(&root.join("version.ini"), b"20250101");
         write_file(&root.join("local").join("old.txt"), b"old");
 
-        update(&root, "game", successful_unpacker())
+        update(&root, state.path(), "game", successful_unpacker(), None)
             .await
             .expect("update should succeed");
 
@@ -634,19 +809,20 @@ mod tests {
         assert!(!root.join("local").join("old.txt").exists());
         assert!(!root.join(".local.installing").exists());
         assert!(!root.join(".local.backup").exists());
-        let intent = read_intent(&root, "game").await;
+        let intent = read_intent(state.path(), "game").await;
         assert_eq!(intent.state, InstallIntentState::None);
     }
 
     #[tokio::test]
     async fn uninstall_removes_only_local_install() {
         let temp = TempDir::new("lanspread-install");
+        let state = test_state();
         let root = temp.game_root();
         write_file(&root.join("game.eti"), b"archive");
         write_file(&root.join("version.ini"), b"20250101");
         write_file(&root.join("local").join("payload.txt"), b"installed");
 
-        uninstall(&root, "game")
+        uninstall(&root, state.path(), "game")
             .await
             .expect("uninstall should succeed");
 
@@ -661,6 +837,7 @@ mod tests {
         use std::os::unix::fs::PermissionsExt;
 
         let temp = TempDir::new("lanspread-install");
+        let state = test_state();
         let root = temp.game_root();
         let locked_dir = root.join("local").join("locked");
         write_file(&root.join("version.ini"), b"20250101");
@@ -669,7 +846,7 @@ mod tests {
         std::fs::set_permissions(&locked_dir, std::fs::Permissions::from_mode(0o500))
             .expect("locked dir permissions should be set");
 
-        let _err = uninstall(&root, "game")
+        let _err = uninstall(&root, state.path(), "game")
             .await
             .expect_err("uninstall should fail while deleting backup");
 
@@ -697,7 +874,7 @@ mod tests {
             b"locked"
         );
         assert!(!root.join(".local.backup").exists());
-        let intent = read_intent(&root, "game").await;
+        let intent = read_intent(state.path(), "game").await;
         assert_eq!(intent.state, InstallIntentState::None);
     }
 
@@ -844,23 +1021,25 @@ mod tests {
             },
         ];
 
+        let state = test_state();
         for case in cases {
             let temp = TempDir::new("lanspread-install");
             let root = temp.game_root();
             seed_recovery_case(&root, &case);
             write_intent(
-                &root,
+                state.path(),
+                "game",
                 &InstallIntent::new("game", case.intent_state.clone(), Some("20250101".into())),
             )
             .await
             .unwrap_or_else(|err| panic!("{} intent should be written: {err}", case.name));
 
-            recover_game_root(&root, "game")
+            recover_game_root(&root, state.path(), "game")
                 .await
                 .unwrap_or_else(|err| panic!("{} recovery should succeed: {err}", case.name));
 
             assert_recovered_case(&root, &case);
-            let intent = read_intent(&root, "game").await;
+            let intent = read_intent(state.path(), "game").await;
             assert_eq!(intent.state, InstallIntentState::None, "{}", case.name);
             assert_eq!(
                 intent.eti_version.as_deref(),
@@ -874,10 +1053,11 @@ mod tests {
     #[tokio::test]
     async fn none_recovery_leaves_markerless_reserved_dirs_untouched() {
         let temp = TempDir::new("lanspread-install");
+        let state = test_state();
         let root = temp.game_root();
         write_file(&root.join(".local.backup").join("user.txt"), b"user");
 
-        recover_game_root(&root, "game")
+        recover_game_root(&root, state.path(), "game")
             .await
             .expect("recovery should succeed");
 
@@ -887,11 +1067,12 @@ mod tests {
     #[tokio::test]
     async fn download_recovery_sweeps_reserved_version_files() {
         let temp = TempDir::new("lanspread-install");
+        let state = test_state();
         let root = temp.game_root();
         write_file(&root.join(VERSION_TMP_FILE), b"tmp");
         write_file(&root.join(VERSION_DISCARDED_FILE), b"old");
 
-        recover_game_root(&root, "game")
+        recover_game_root(&root, state.path(), "game")
             .await
             .expect("recovery should succeed");
 
@@ -902,14 +1083,19 @@ mod tests {
     #[tokio::test]
     async fn startup_recovery_skips_active_game_roots() {
         let temp = TempDir::new("lanspread-install");
+        let state = test_state();
         let active_root = temp.path().join("active");
         let inactive_root = temp.path().join("inactive");
         write_file(&active_root.join(VERSION_TMP_FILE), b"tmp");
         write_file(&inactive_root.join(VERSION_TMP_FILE), b"tmp");
 
-        recover_on_startup(temp.path(), &HashSet::from(["active".to_string()]))
-            .await
-            .expect("recovery should succeed");
+        recover_on_startup(
+            temp.path(),
+            state.path(),
+            &HashSet::from(["active".to_string()]),
+        )
+        .await
+        .expect("recovery should succeed");
 
         assert!(active_root.join(VERSION_TMP_FILE).is_file());
         assert!(!inactive_root.join(VERSION_TMP_FILE).exists());

crates/lanspread-peer/src/lib.rs

@@ -22,6 +22,7 @@ mod identity;
 mod install;
 mod library;
 mod local_games;
+mod migration;
 mod network;
 mod path_validation;
 mod peer;
@@ -29,6 +30,7 @@ mod peer_db;
 mod remote_peer;
 mod services;
 mod startup;
+mod state_paths;
 #[cfg(test)]
 mod test_support;
 
@@ -42,6 +44,7 @@ pub use config::{CHUNK_SIZE, MAX_RETRY_COUNT};
 pub use error::PeerError;
 pub use install::{UnpackFuture, Unpacker};
 use lanspread_db::db::{Game, GameFileDescription};
+pub use migration::{MigrationReport, migrate_legacy_state};
 pub use peer_db::{
     MajorityValidationResult,
     PeerGameDB,
@@ -56,7 +59,6 @@ use tokio::sync::{
 };
 use tokio_util::{sync::CancellationToken, task::TaskTracker};
 
-pub use crate::startup::PeerRuntimeHandle;
 use crate::{
     context::Ctx,
     handlers::{
@@ -73,7 +75,9 @@ use crate::{
         handle_uninstall_game_command,
         load_local_library,
     },
+    state_paths::resolve_state_dir,
 };
+pub use crate::{startup::PeerRuntimeHandle, state_paths::setup_done_path};
 
 // =============================================================================
 // Public API types
@@ -225,15 +229,20 @@ pub enum PeerCommand {
     DownloadGameFiles {
         id: String,
         file_descriptions: Vec<GameFileDescription>,
+        account_name: Option<String>,
     },
     /// Download game files with an explicit install policy.
     DownloadGameFilesWithOptions {
         id: String,
         file_descriptions: Vec<GameFileDescription>,
         install_after_download: bool,
+        account_name: Option<String>,
     },
     /// Install already-downloaded archives into `local/`.
-    InstallGame { id: String },
+    InstallGame {
+        id: String,
+        account_name: Option<String>,
+    },
     /// Remove only the `local/` install for a game.
     UninstallGame { id: String },
     /// Remove downloaded archive files for an uninstalled game.
@@ -300,12 +309,13 @@ pub fn start_peer_with_options(
     options: PeerStartOptions,
 ) -> eyre::Result<PeerRuntimeHandle> {
     let PeerStartOptions { state_dir } = options;
+    let state_dir = resolve_state_dir(state_dir.as_deref());
     let game_dir = game_dir.into();
     log::info!(
         "Starting peer system with game directory: {}",
         game_dir.display()
     );
-    let peer_id = identity::load_or_create_peer_id(state_dir.as_deref())?;
+    let peer_id = identity::load_or_create_peer_id(&state_dir)?;
 
     let (tx_control, rx_control) = tokio::sync::mpsc::unbounded_channel();
 
@@ -316,6 +326,7 @@ pub fn start_peer_with_options(
         peer_game_db,
         peer_id,
         game_dir,
+        state_dir,
         unpacker,
         catalog,
     ))
@@ -329,6 +340,7 @@ async fn run_peer(
     peer_game_db: Arc<RwLock<PeerGameDB>>,
     peer_id: String,
     game_dir: PathBuf,
+    state_dir: PathBuf,
     unpacker: Arc<dyn Unpacker>,
     shutdown: CancellationToken,
     task_tracker: TaskTracker,
@@ -338,6 +350,7 @@ async fn run_peer(
         peer_game_db,
         peer_id,
         game_dir,
+        state_dir,
         unpacker,
         shutdown,
         task_tracker,
@@ -397,14 +410,23 @@ async fn handle_peer_commands(
             PeerCommand::DownloadGameFiles {
                 id,
                 file_descriptions,
+                account_name,
             } => {
-                handle_download_game_files_command(ctx, tx_notify_ui, id, file_descriptions, true)
-                    .await;
+                handle_download_game_files_command(
+                    ctx,
+                    tx_notify_ui,
+                    id,
+                    file_descriptions,
+                    true,
+                    account_name,
+                )
+                .await;
             }
             PeerCommand::DownloadGameFilesWithOptions {
                 id,
                 file_descriptions,
                 install_after_download,
+                account_name,
             } => {
                 handle_download_game_files_command(
                     ctx,
@@ -412,11 +434,12 @@ async fn handle_peer_commands(
                     id,
                     file_descriptions,
                     install_after_download,
+                    account_name,
                 )
                 .await;
             }
-            PeerCommand::InstallGame { id } => {
-                handle_install_game_command(ctx, tx_notify_ui, id).await;
+            PeerCommand::InstallGame { id, account_name } => {
+                handle_install_game_command(ctx, tx_notify_ui, id, account_name).await;
             }
             PeerCommand::UninstallGame { id } => {
                 handle_uninstall_game_command(ctx, tx_notify_ui, id).await;

crates/lanspread-peer/src/local_games.rs

@@ -71,7 +71,7 @@ pub async fn local_download_available(
 // Local library index and scanning
 // =============================================================================
 
-const LIBRARY_INDEX_DIR: &str = ".lanspread";
+const LEGACY_LIBRARY_INDEX_DIR: &str = ".lanspread";
 const LIBRARY_INDEX_FILE: &str = "library_index.json";
 const INTENT_LOG_FILE: &str = ".lanspread.json";
 const VERSION_TMP_FILE: &str = ".version.ini.tmp";
@@ -114,8 +114,14 @@ pub struct LocalLibraryScan {
     pub revision: u64,
 }
 
-fn library_index_path(game_dir: &Path) -> PathBuf {
-    game_dir.join(LIBRARY_INDEX_DIR).join(LIBRARY_INDEX_FILE)
+pub(crate) fn legacy_library_index_path(game_dir: &Path) -> PathBuf {
+    game_dir
+        .join(LEGACY_LIBRARY_INDEX_DIR)
+        .join(LIBRARY_INDEX_FILE)
+}
+
+fn library_index_path(state_dir: &Path) -> PathBuf {
+    crate::state_paths::local_library_index_path(state_dir)
 }
 
 fn library_index_tmp_path(path: &Path) -> PathBuf {
@@ -278,7 +284,7 @@ async fn fingerprint_game_dir(game_path: &Path) -> eyre::Result<GameFingerprint>
 }
 
 pub fn is_ignored_game_root_name(name: &str) -> bool {
-    name == LIBRARY_INDEX_DIR
+    name == LEGACY_LIBRARY_INDEX_DIR
 }
 
 fn is_reserved_transient_name(name: &str) -> bool {
@@ -286,7 +292,7 @@ fn is_reserved_transient_name(name: &str) -> bool {
         || name == VERSION_TMP_FILE
         || name == VERSION_DISCARDED_FILE
         || name == INTENT_LOG_FILE
-        || name == LIBRARY_INDEX_DIR
+        || name == LEGACY_LIBRARY_INDEX_DIR
 }
 
 fn should_skip_root_entry(entry: &walkdir::DirEntry) -> bool {
@@ -550,9 +556,11 @@ fn scan_from_index(index: &LibraryIndex) -> LocalLibraryScan {
 /// Scans the local game directory and returns summaries plus a game database.
 pub async fn scan_local_library(
     game_dir: impl AsRef<Path>,
+    state_dir: impl AsRef<Path>,
     catalog: &HashSet<String>,
 ) -> eyre::Result<LocalLibraryScan> {
     let game_path = game_dir.as_ref();
+    let state_path = state_dir.as_ref();
 
     let metadata = match tokio::fs::metadata(game_path).await {
         Ok(metadata) => metadata,
@@ -577,7 +585,7 @@ pub async fn scan_local_library(
     }
 
     let _index_guard = LIBRARY_INDEX_LOCK.lock().await;
-    let index_path = library_index_path(game_path);
+    let index_path = library_index_path(state_path);
     let mut index = load_library_index(&index_path).await;
     let mut seen_ids = HashSet::new();
     let mut summaries = HashMap::new();
@@ -636,12 +644,14 @@ pub async fn scan_local_library(
 /// Rescans a single game root through the cached index and returns full library state.
 pub async fn rescan_local_game(
     game_dir: impl AsRef<Path>,
+    state_dir: impl AsRef<Path>,
     catalog: &HashSet<String>,
     game_id: &str,
 ) -> eyre::Result<LocalLibraryScan> {
     let game_path = game_dir.as_ref();
+    let state_path = state_dir.as_ref();
     let _index_guard = LIBRARY_INDEX_LOCK.lock().await;
-    let index_path = library_index_path(game_path);
+    let index_path = library_index_path(state_path);
     let mut index = load_library_index(&index_path).await;
 
     let update = update_index_for_game(game_path, game_id, catalog, &mut index).await?;
@@ -765,6 +775,7 @@ mod tests {
     #[tokio::test]
     async fn scan_uses_version_ini_and_local_dir_as_independent_state() {
         let temp = TempDir::new("lanspread-local-games");
+        let state = TempDir::new("lanspread-local-games-state");
         let catalog = HashSet::from([
             "ready".to_string(),
             "local-only".to_string(),
@@ -783,7 +794,7 @@ mod tests {
             b"20250101",
         );
 
-        let scan = scan_local_library(temp.path(), &catalog)
+        let scan = scan_local_library(temp.path(), state.path(), &catalog)
             .await
             .expect("scan should succeed");
 
@@ -818,11 +829,12 @@ mod tests {
     #[tokio::test]
     async fn rescan_promotes_installed_only_game_to_ready_when_sentinel_appears() {
         let temp = TempDir::new("lanspread-local-games");
+        let state = TempDir::new("lanspread-local-games-state");
         let catalog = HashSet::from(["game".to_string()]);
         std::fs::create_dir_all(temp.path().join("game").join("local"))
             .expect("local install dir should be created");
 
-        let first_scan = scan_local_library(temp.path(), &catalog)
+        let first_scan = scan_local_library(temp.path(), state.path(), &catalog)
             .await
             .expect("initial scan should succeed");
         let local_only = first_scan
@@ -835,7 +847,7 @@ mod tests {
 
         write_file(&temp.path().join("game").join("version.ini"), b"20250101");
 
-        let rescan = rescan_local_game(temp.path(), &catalog, "game")
+        let rescan = rescan_local_game(temp.path(), state.path(), &catalog, "game")
             .await
             .expect("rescan should succeed");
         let ready = rescan
@@ -851,11 +863,12 @@ mod tests {
     #[tokio::test]
     async fn concurrent_rescans_preserve_both_index_updates() {
         let temp = TempDir::new("lanspread-local-games-concurrent");
+        let state = TempDir::new("lanspread-local-games-state");
         let catalog = HashSet::from(["game-a".to_string(), "game-b".to_string()]);
         write_file(&temp.path().join("game-a").join("version.ini"), b"20250101");
         write_file(&temp.path().join("game-b").join("version.ini"), b"20250101");
 
-        let initial = scan_local_library(temp.path(), &catalog)
+        let initial = scan_local_library(temp.path(), state.path(), &catalog)
             .await
             .expect("initial scan should succeed");
         assert_eq!(initial.revision, 1);
@@ -864,13 +877,13 @@ mod tests {
         write_file(&temp.path().join("game-b").join("game-b.eti"), b"archive-b");
 
         let (scan_a, scan_b) = tokio::join!(
-            rescan_local_game(temp.path(), &catalog, "game-a"),
-            rescan_local_game(temp.path(), &catalog, "game-b")
+            rescan_local_game(temp.path(), state.path(), &catalog, "game-a"),
+            rescan_local_game(temp.path(), state.path(), &catalog, "game-b")
         );
         scan_a.expect("game-a rescan should succeed");
         scan_b.expect("game-b rescan should succeed");
 
-        let index = load_library_index(&library_index_path(temp.path())).await;
+        let index = load_library_index(&library_index_path(state.path())).await;
         assert_eq!(index.revision, 3);
         let game_a = index
             .games

crates/lanspread-peer/src/migration.rs

@@ -0,0 +1,612 @@
+use std::{
+    io::ErrorKind,
+    path::{Path, PathBuf},
+    time::Instant,
+};
+
+use futures::{StreamExt as _, stream};
+use tokio::io::AsyncWriteExt as _;
+
+use crate::{
+    install::intent::{
+        InstallIntent,
+        LEGACY_INTENT_FILE,
+        LEGACY_INTENT_TMP_FILE,
+        intent_path,
+        write_intent,
+    },
+    local_games::{is_ignored_game_root_name, legacy_library_index_path},
+    state_paths::{local_library_index_path, setup_done_path},
+};
+
+const LEGACY_LIBRARY_INDEX_DIR: &str = ".lanspread";
+const LEGACY_FIRST_START_DONE_FILE: &str = ".softlan_first_start_done";
+const LEGACY_SOFTLAN_INSTALL_MARKER: &str = ".softlan_game_installed";
+const MIGRATION_CONCURRENCY: usize = 16;
+
+#[derive(Clone, Copy, Debug, Default, Eq, PartialEq, serde::Serialize)]
+pub struct MigrationReport {
+    pub games_checked: usize,
+    pub library_index_migrated: bool,
+    pub install_intents_migrated: usize,
+    pub setup_markers_migrated: usize,
+    pub legacy_files_deleted: usize,
+    pub unknown_softlan_files: usize,
+    pub failures: usize,
+}
+
+impl MigrationReport {
+    fn merge(&mut self, other: Self) {
+        self.games_checked += other.games_checked;
+        self.library_index_migrated |= other.library_index_migrated;
+        self.install_intents_migrated += other.install_intents_migrated;
+        self.setup_markers_migrated += other.setup_markers_migrated;
+        self.legacy_files_deleted += other.legacy_files_deleted;
+        self.unknown_softlan_files += other.unknown_softlan_files;
+        self.failures += other.failures;
+    }
+}
+
+/// Migrates legacy app-owned files out of the configured game directory.
+///
+/// This is intentionally separate from normal operation: callers should run it
+/// before starting the peer runtime for a game directory.
+pub async fn migrate_legacy_state(game_dir: &Path, state_dir: &Path) -> MigrationReport {
+    let started = Instant::now();
+    let mut report = MigrationReport::default();
+
+    report.merge(migrate_library_index(game_dir, state_dir).await);
+
+    let game_roots = match collect_game_roots(game_dir).await {
+        Ok(game_roots) => game_roots,
+        Err(err) => {
+            if err.kind() != ErrorKind::NotFound {
+                log::warn!(
+                    "Failed to enumerate game roots for legacy state migration in {}: {err}",
+                    game_dir.display()
+                );
+                report.failures += 1;
+            }
+            log_migration_report(&report, started);
+            return report;
+        }
+    };
+
+    let game_reports = stream::iter(game_roots)
+        .map(|(id, root)| async move { migrate_game_root(state_dir, id, root).await })
+        .buffer_unordered(MIGRATION_CONCURRENCY)
+        .collect::<Vec<_>>()
+        .await;
+
+    for game_report in game_reports {
+        report.merge(game_report);
+    }
+
+    log_migration_report(&report, started);
+    report
+}
+
+async fn collect_game_roots(game_dir: &Path) -> std::io::Result<Vec<(String, PathBuf)>> {
+    let mut roots = Vec::new();
+    let mut entries = tokio::fs::read_dir(game_dir).await?;
+    while let Some(entry) = entries.next_entry().await? {
+        if !entry.file_type().await?.is_dir() {
+            continue;
+        }
+
+        let Some(id) = entry.file_name().to_str().map(ToOwned::to_owned) else {
+            continue;
+        };
+        if is_ignored_game_root_name(&id) {
+            continue;
+        }
+
+        roots.push((id, entry.path()));
+    }
+    Ok(roots)
+}
+
+async fn migrate_library_index(game_dir: &Path, state_dir: &Path) -> MigrationReport {
+    let mut report = MigrationReport::default();
+    let legacy_path = legacy_library_index_path(game_dir);
+    let target_path = local_library_index_path(state_dir);
+
+    match migrate_raw_file(&legacy_path, &target_path).await {
+        Ok(MigrationOutcome::Migrated) => {
+            report.library_index_migrated = true;
+            report.legacy_files_deleted += 1;
+        }
+        Ok(MigrationOutcome::TargetAlreadyExists) => {
+            report.legacy_files_deleted += 1;
+        }
+        Ok(MigrationOutcome::SourceMissing) => {}
+        Err(err) => {
+            log::warn!(
+                "Failed to migrate legacy library index {} to {}: {err}",
+                legacy_path.display(),
+                target_path.display()
+            );
+            report.failures += 1;
+        }
+    }
+
+    report.merge(delete_if_exists(&library_index_tmp_path(&legacy_path)).await);
+    report.merge(remove_empty_legacy_library_dir(game_dir).await);
+    report
+}
+
+async fn migrate_game_root(state_dir: &Path, id: String, root: PathBuf) -> MigrationReport {
+    let mut report = MigrationReport {
+        games_checked: 1,
+        ..MigrationReport::default()
+    };
+
+    report.merge(migrate_install_intent(state_dir, &id, &root).await);
+    report.merge(delete_if_exists(&root.join(LEGACY_INTENT_TMP_FILE)).await);
+    report.merge(migrate_setup_marker(state_dir, &id, &root).await);
+    report.merge(delete_if_exists(&root.join(LEGACY_SOFTLAN_INSTALL_MARKER)).await);
+    report.merge(note_unknown_softlan_files(&root).await);
+
+    report
+}
+
+async fn migrate_install_intent(state_dir: &Path, id: &str, root: &Path) -> MigrationReport {
+    let mut report = MigrationReport::default();
+    let legacy_path = root.join(LEGACY_INTENT_FILE);
+    let target_path = intent_path(state_dir, id);
+
+    match path_exists(&legacy_path).await {
+        Ok(false) => return report,
+        Ok(true) => {}
+        Err(err) => {
+            log::warn!(
+                "Failed to inspect legacy install intent {}: {err}",
+                legacy_path.display()
+            );
+            report.failures += 1;
+            return report;
+        }
+    }
+
+    match path_exists(&target_path).await {
+        Ok(true) => {
+            report.merge(delete_file(&legacy_path).await);
+            return report;
+        }
+        Ok(false) => {}
+        Err(err) => {
+            log::warn!(
+                "Failed to inspect app-state install intent {}: {err}",
+                target_path.display()
+            );
+            report.failures += 1;
+            return report;
+        }
+    }
+
+    let data = match tokio::fs::read_to_string(&legacy_path).await {
+        Ok(data) => data,
+        Err(err) => {
+            log::warn!(
+                "Failed to read legacy install intent {}: {err}",
+                legacy_path.display()
+            );
+            report.failures += 1;
+            return report;
+        }
+    };
+
+    let intent = match serde_json::from_str::<InstallIntent>(&data) {
+        Ok(intent) if intent.is_current_for(id) => intent,
+        Ok(intent) => {
+            log::warn!(
+                "Leaving legacy install intent {} in place because it belongs to id {} schema {}",
+                legacy_path.display(),
+                intent.id,
+                intent.schema_version
+            );
+            report.failures += 1;
+            return report;
+        }
+        Err(err) => {
+            log::warn!(
+                "Leaving corrupt legacy install intent {} in place: {err}",
+                legacy_path.display()
+            );
+            report.failures += 1;
+            return report;
+        }
+    };
+
+    if let Err(err) = write_intent(state_dir, id, &intent).await {
+        log::warn!(
+            "Failed to write migrated install intent {}: {err}",
+            target_path.display()
+        );
+        report.failures += 1;
+        return report;
+    }
+
+    report.install_intents_migrated += 1;
+    report.merge(delete_file(&legacy_path).await);
+    report
+}
+
+async fn migrate_setup_marker(state_dir: &Path, id: &str, root: &Path) -> MigrationReport {
+    let mut report = MigrationReport::default();
+    let legacy_path = root.join("local").join(LEGACY_FIRST_START_DONE_FILE);
+    let target_path = setup_done_path(state_dir, id);
+
+    match migrate_empty_marker(&legacy_path, &target_path).await {
+        Ok(MigrationOutcome::Migrated) => {
+            report.setup_markers_migrated += 1;
+            report.legacy_files_deleted += 1;
+        }
+        Ok(MigrationOutcome::TargetAlreadyExists) => {
+            report.legacy_files_deleted += 1;
+        }
+        Ok(MigrationOutcome::SourceMissing) => {}
+        Err(err) => {
+            log::warn!(
+                "Failed to migrate legacy setup marker {} to {}: {err}",
+                legacy_path.display(),
+                target_path.display()
+            );
+            report.failures += 1;
+        }
+    }
+
+    report
+}
+
+async fn note_unknown_softlan_files(root: &Path) -> MigrationReport {
+    let mut report = MigrationReport::default();
+    report.unknown_softlan_files += count_unknown_softlan_files(root).await;
+    report.unknown_softlan_files += count_unknown_softlan_files(&root.join("local")).await;
+    report
+}
+
+async fn count_unknown_softlan_files(dir: &Path) -> usize {
+    let mut count = 0;
+    let mut entries = match tokio::fs::read_dir(dir).await {
+        Ok(entries) => entries,
+        Err(err) if err.kind() == ErrorKind::NotFound => return 0,
+        Err(err) => {
+            log::warn!(
+                "Failed to inspect {} for legacy .softlan files: {err}",
+                dir.display()
+            );
+            return 0;
+        }
+    };
+
+    while let Ok(Some(entry)) = entries.next_entry().await {
+        let Some(name) = entry.file_name().to_str().map(ToOwned::to_owned) else {
+            continue;
+        };
+        if !name.starts_with(".softlan_")
+            || name == LEGACY_SOFTLAN_INSTALL_MARKER
+            || name == LEGACY_FIRST_START_DONE_FILE
+        {
+            continue;
+        }
+        count += 1;
+        log::info!(
+            "Leaving unknown legacy .softlan file in place: {}",
+            entry.path().display()
+        );
+    }
+
+    count
+}
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+enum MigrationOutcome {
+    SourceMissing,
+    TargetAlreadyExists,
+    Migrated,
+}
+
+async fn migrate_raw_file(
+    legacy_path: &Path,
+    target_path: &Path,
+) -> std::io::Result<MigrationOutcome> {
+    if !path_exists(legacy_path).await? {
+        return Ok(MigrationOutcome::SourceMissing);
+    }
+
+    if path_exists(target_path).await? {
+        remove_file_if_exists(legacy_path).await?;
+        return Ok(MigrationOutcome::TargetAlreadyExists);
+    }
+
+    let data = tokio::fs::read(legacy_path).await?;
+    write_bytes_atomically(target_path, &data).await?;
+    remove_file_if_exists(legacy_path).await?;
+    Ok(MigrationOutcome::Migrated)
+}
+
+async fn migrate_empty_marker(
+    legacy_path: &Path,
+    target_path: &Path,
+) -> std::io::Result<MigrationOutcome> {
+    if !path_exists(legacy_path).await? {
+        return Ok(MigrationOutcome::SourceMissing);
+    }
+
+    if path_exists(target_path).await? {
+        remove_file_if_exists(legacy_path).await?;
+        return Ok(MigrationOutcome::TargetAlreadyExists);
+    }
+
+    if let Some(parent) = target_path.parent() {
+        tokio::fs::create_dir_all(parent).await?;
+    }
+    tokio::fs::File::create(target_path)
+        .await?
+        .sync_all()
+        .await?;
+    remove_file_if_exists(legacy_path).await?;
+    Ok(MigrationOutcome::Migrated)
+}
+
+async fn write_bytes_atomically(path: &Path, data: &[u8]) -> std::io::Result<()> {
+    if let Some(parent) = path.parent() {
+        tokio::fs::create_dir_all(parent).await?;
+    }
+
+    let tmp_path = library_index_tmp_path(path);
+    let mut file = tokio::fs::File::create(&tmp_path).await?;
+    file.write_all(data).await?;
+    file.sync_all().await?;
+    drop(file);
+
+    tokio::fs::rename(&tmp_path, path).await?;
+    sync_parent_dir(path)
+}
+
+fn library_index_tmp_path(path: &Path) -> PathBuf {
+    let Some(file_name) = path.file_name() else {
+        return path.with_extension("tmp");
+    };
+
+    let mut tmp_name = file_name.to_os_string();
+    tmp_name.push(".tmp");
+    path.with_file_name(tmp_name)
+}
+
+async fn path_exists(path: &Path) -> std::io::Result<bool> {
+    match tokio::fs::metadata(path).await {
+        Ok(_) => Ok(true),
+        Err(err) if err.kind() == ErrorKind::NotFound => Ok(false),
+        Err(err) => Err(err),
+    }
+}
+
+async fn delete_if_exists(path: &Path) -> MigrationReport {
+    match remove_file_if_exists(path).await {
+        Ok(true) => MigrationReport {
+            legacy_files_deleted: 1,
+            ..MigrationReport::default()
+        },
+        Ok(false) => MigrationReport::default(),
+        Err(err) => {
+            log::warn!("Failed to delete legacy file {}: {err}", path.display());
+            MigrationReport {
+                failures: 1,
+                ..MigrationReport::default()
+            }
+        }
+    }
+}
+
+async fn delete_file(path: &Path) -> MigrationReport {
+    match remove_file_if_exists(path).await {
+        Ok(true) => MigrationReport {
+            legacy_files_deleted: 1,
+            ..MigrationReport::default()
+        },
+        Ok(false) => MigrationReport::default(),
+        Err(err) => {
+            log::warn!("Failed to delete legacy file {}: {err}", path.display());
+            MigrationReport {
+                failures: 1,
+                ..MigrationReport::default()
+            }
+        }
+    }
+}
+
+async fn remove_file_if_exists(path: &Path) -> std::io::Result<bool> {
+    if !path_exists(path).await? {
+        return Ok(false);
+    }
+
+    match tokio::fs::remove_file(path).await {
+        Ok(()) => Ok(true),
+        Err(err) if err.kind() == ErrorKind::NotFound => Ok(false),
+        Err(err) => Err(err),
+    }
+}
+
+async fn remove_empty_legacy_library_dir(game_dir: &Path) -> MigrationReport {
+    let path = game_dir.join(LEGACY_LIBRARY_INDEX_DIR);
+    let exists = match path_exists(&path).await {
+        Ok(exists) => exists,
+        Err(err) => {
+            log::warn!(
+                "Failed to inspect legacy library index directory {}: {err}",
+                path.display()
+            );
+            return MigrationReport {
+                failures: 1,
+                ..MigrationReport::default()
+            };
+        }
+    };
+    if !exists {
+        return MigrationReport::default();
+    }
+
+    match tokio::fs::remove_dir(&path).await {
+        Ok(()) => MigrationReport {
+            legacy_files_deleted: 1,
+            ..MigrationReport::default()
+        },
+        Err(err)
+            if err.kind() == ErrorKind::NotFound || err.kind() == ErrorKind::DirectoryNotEmpty =>
+        {
+            MigrationReport::default()
+        }
+        Err(err) => {
+            log::warn!(
+                "Failed to remove empty legacy library index directory {}: {err}",
+                path.display()
+            );
+            MigrationReport {
+                failures: 1,
+                ..MigrationReport::default()
+            }
+        }
+    }
+}
+
+fn log_migration_report(report: &MigrationReport, started: Instant) {
+    log::info!(
+        "Legacy state migration finished in {:?}: games_checked={}, library_index_migrated={}, \
+         install_intents_migrated={}, setup_markers_migrated={}, legacy_files_deleted={}, \
+         unknown_softlan_files={}, failures={}",
+        started.elapsed(),
+        report.games_checked,
+        report.library_index_migrated,
+        report.install_intents_migrated,
+        report.setup_markers_migrated,
+        report.legacy_files_deleted,
+        report.unknown_softlan_files,
+        report.failures
+    );
+}
+
+#[cfg(unix)]
+fn sync_parent_dir(path: &Path) -> std::io::Result<()> {
+    if let Some(parent) = path.parent() {
+        std::fs::File::open(parent)?.sync_all()?;
+    }
+    Ok(())
+}
+
+#[cfg(not(unix))]
+fn sync_parent_dir(_path: &Path) -> std::io::Result<()> {
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::{
+        install::intent::{InstallIntentState, read_intent},
+        test_support::TempDir,
+    };
+
+    fn write_file(path: &Path, bytes: &[u8]) {
+        if let Some(parent) = path.parent() {
+            std::fs::create_dir_all(parent).expect("parent dir should be created");
+        }
+        std::fs::write(path, bytes).expect("file should be written");
+    }
+
+    #[tokio::test]
+    async fn migrates_legacy_library_index_to_app_state() {
+        let games = TempDir::new("lanspread-migration-games");
+        let state = TempDir::new("lanspread-migration-state");
+        let legacy_path = legacy_library_index_path(games.path());
+        let target_path = local_library_index_path(state.path());
+        let legacy_tmp_path = library_index_tmp_path(&legacy_path);
+
+        write_file(&legacy_path, br#"{"revision":7,"games":{}}"#);
+        write_file(&legacy_tmp_path, b"tmp");
+
+        let report = migrate_legacy_state(games.path(), state.path()).await;
+
+        assert!(report.library_index_migrated);
+        assert_eq!(
+            std::fs::read_to_string(&target_path).expect("index should migrate"),
+            r#"{"revision":7,"games":{}}"#
+        );
+        assert!(!legacy_path.exists());
+        assert!(!legacy_tmp_path.exists());
+        assert!(!games.path().join(LEGACY_LIBRARY_INDEX_DIR).exists());
+    }
+
+    #[tokio::test]
+    async fn migrates_per_game_intent_and_setup_marker() {
+        let games = TempDir::new("lanspread-migration-games");
+        let state = TempDir::new("lanspread-migration-state");
+        let root = games.path().join("game");
+        let intent = InstallIntent::new(
+            "game",
+            InstallIntentState::Updating,
+            Some("20250101".to_string()),
+        );
+        let legacy_intent = root.join(LEGACY_INTENT_FILE);
+        let legacy_tmp = root.join(LEGACY_INTENT_TMP_FILE);
+        let legacy_setup = root.join("local").join(LEGACY_FIRST_START_DONE_FILE);
+        let legacy_marker = root.join(LEGACY_SOFTLAN_INSTALL_MARKER);
+
+        write_file(
+            &legacy_intent,
+            &serde_json::to_vec_pretty(&intent).expect("intent should serialize"),
+        );
+        write_file(&legacy_tmp, b"tmp");
+        write_file(&legacy_setup, b"");
+        write_file(&legacy_marker, b"");
+
+        let report = migrate_legacy_state(games.path(), state.path()).await;
+
+        assert_eq!(report.install_intents_migrated, 1);
+        assert_eq!(report.setup_markers_migrated, 1);
+        let migrated_intent = read_intent(state.path(), "game").await;
+        assert_eq!(migrated_intent.state, InstallIntentState::Updating);
+        assert_eq!(migrated_intent.eti_version.as_deref(), Some("20250101"));
+        assert!(setup_done_path(state.path(), "game").is_file());
+        assert!(!legacy_intent.exists());
+        assert!(!legacy_tmp.exists());
+        assert!(!legacy_setup.exists());
+        assert!(!legacy_marker.exists());
+    }
+
+    #[tokio::test]
+    async fn app_state_wins_over_legacy_per_game_state() {
+        let games = TempDir::new("lanspread-migration-games");
+        let state = TempDir::new("lanspread-migration-state");
+        let root = games.path().join("game");
+        let app_intent = InstallIntent::none("game", Some("app".to_string()));
+        let legacy_intent = InstallIntent::new(
+            "game",
+            InstallIntentState::Installing,
+            Some("legacy".to_string()),
+        );
+        let legacy_intent_path = root.join(LEGACY_INTENT_FILE);
+        let legacy_setup = root.join("local").join(LEGACY_FIRST_START_DONE_FILE);
+
+        write_intent(state.path(), "game", &app_intent)
+            .await
+            .expect("app-state intent should be written");
+        write_file(
+            &legacy_intent_path,
+            &serde_json::to_vec_pretty(&legacy_intent).expect("intent should serialize"),
+        );
+        write_file(&setup_done_path(state.path(), "game"), b"");
+        write_file(&legacy_setup, b"");
+
+        let report = migrate_legacy_state(games.path(), state.path()).await;
+
+        assert_eq!(report.install_intents_migrated, 0);
+        assert_eq!(report.setup_markers_migrated, 0);
+        let intent = read_intent(state.path(), "game").await;
+        assert_eq!(intent.state, InstallIntentState::None);
+        assert_eq!(intent.eti_version.as_deref(), Some("app"));
+        assert!(!legacy_intent_path.exists());
+        assert!(!legacy_setup.exists());
+    }
+}

crates/lanspread-peer/src/services/handshake.rs

@@ -305,6 +305,7 @@ mod tests {
             peer_game_db.clone(),
             "local-peer".to_string(),
             PathBuf::new(),
+            PathBuf::new(),
             Arc::new(NoopUnpacker),
             CancellationToken::new(),
             TaskTracker::new(),

crates/lanspread-peer/src/services/local_monitor.rs

@@ -277,7 +277,7 @@ async fn run_gated_rescan(
 
         let game_dir = ctx.game_dir.read().await.clone();
         let catalog = ctx.catalog.read().await.clone();
-        match rescan_local_game(&game_dir, &catalog, &id).await {
+        match rescan_local_game(&game_dir, ctx.state_dir.as_ref(), &catalog, &id).await {
             Ok(scan) => update_and_announce_games(&ctx, &tx_notify_ui, scan).await,
             Err(err) => log::error!("Failed to rescan local game {id}: {err}"),
         }
@@ -293,7 +293,7 @@ async fn run_gated_rescan(
 async fn run_fallback_scan(ctx: &Ctx, tx_notify_ui: &UnboundedSender<PeerEvent>) {
     let game_dir = ctx.game_dir.read().await.clone();
     let catalog = ctx.catalog.read().await.clone();
-    match scan_local_library(&game_dir, &catalog).await {
+    match scan_local_library(&game_dir, ctx.state_dir.as_ref(), &catalog).await {
         Ok(scan) => update_and_announce_games(ctx, tx_notify_ui, scan).await,
         Err(err) => log::error!("Failed to scan local games directory: {err}"),
     }
@@ -377,7 +377,8 @@ mod tests {
         Ctx::new(
             Arc::new(RwLock::new(PeerGameDB::new())),
             "peer".to_string(),
-            game_dir,
+            game_dir.clone(),
+            game_dir.join(".test-state"),
             Arc::new(NoopUnpacker),
             CancellationToken::new(),
             TaskTracker::new(),

crates/lanspread-peer/src/services/stream.rs

@@ -332,7 +332,8 @@ mod tests {
         Ctx::new(
             Arc::new(RwLock::new(PeerGameDB::new())),
             "peer".to_string(),
-            game_dir,
+            game_dir.clone(),
+            game_dir.join(".test-state"),
             Arc::new(NoopUnpacker),
             CancellationToken::new(),
             TaskTracker::new(),

crates/lanspread-peer/src/startup.rs

@@ -82,6 +82,7 @@ pub(crate) fn spawn_peer_runtime(
     peer_game_db: Arc<RwLock<PeerGameDB>>,
     peer_id: String,
     game_dir: PathBuf,
+    state_dir: PathBuf,
     unpacker: Arc<dyn Unpacker>,
     catalog: Arc<RwLock<std::collections::HashSet<String>>>,
 ) -> PeerRuntimeHandle {
@@ -98,6 +99,7 @@ pub(crate) fn spawn_peer_runtime(
             peer_game_db,
             peer_id,
             game_dir,
+            state_dir,
             unpacker,
             runtime_shutdown.clone(),
             runtime_tracker.clone(),

crates/lanspread-peer/src/state_paths.rs

@@ -0,0 +1,42 @@
+use std::path::{Path, PathBuf};
+
+const PEER_ID_FILE: &str = "peer_id";
+const LOCAL_LIBRARY_DIR: &str = "local_library";
+const LOCAL_LIBRARY_INDEX_FILE: &str = "index.json";
+const GAMES_DIR: &str = "games";
+const SETUP_DONE_FILE: &str = "setup_done";
+
+pub(crate) fn resolve_state_dir(explicit: Option<&Path>) -> PathBuf {
+    if let Some(dir) = explicit {
+        return dir.to_path_buf();
+    }
+
+    if let Some(dir) = std::env::var_os("LANSPREAD_STATE_DIR") {
+        return PathBuf::from(dir);
+    }
+
+    if let Some(home) = std::env::var_os("HOME").or_else(|| std::env::var_os("USERPROFILE")) {
+        return PathBuf::from(home).join(".lanspread");
+    }
+
+    std::env::temp_dir().join("lanspread")
+}
+
+pub(crate) fn peer_id_path(state_dir: &Path) -> PathBuf {
+    state_dir.join(PEER_ID_FILE)
+}
+
+pub(crate) fn local_library_index_path(state_dir: &Path) -> PathBuf {
+    state_dir
+        .join(LOCAL_LIBRARY_DIR)
+        .join(LOCAL_LIBRARY_INDEX_FILE)
+}
+
+pub(crate) fn game_state_dir(state_dir: &Path, game_id: &str) -> PathBuf {
+    state_dir.join(GAMES_DIR).join(game_id)
+}
+
+#[must_use]
+pub fn setup_done_path(state_dir: &Path, game_id: &str) -> PathBuf {
+    game_state_dir(state_dir, game_id).join(SETUP_DONE_FILE)
+}

crates/lanspread-tauri-deno-ts/src-tauri/Cargo.toml

@@ -37,6 +37,7 @@ eyre = { workspace = true }
 log = { workspace = true }
 mimalloc = { workspace = true }
 serde = { workspace = true }
+serde_json = { workspace = true }
 tauri = { workspace = true }
 tauri-plugin-log = { workspace = true }
 tauri-plugin-shell = { workspace = true }

crates/lanspread-tauri-deno-ts/src-tauri/src/lib.rs

@@ -1,10 +1,8 @@
-#[cfg(target_os = "windows")]
-use std::fs::File;
 use std::{
     collections::{HashMap, HashSet},
     net::SocketAddr,
     path::{Component, Path, PathBuf},
-    sync::Arc,
+    sync::{Arc, OnceLock},
     time::{SystemTime, UNIX_EPOCH},
 };
 
@@ -18,9 +16,11 @@ use lanspread_peer::{
     PeerEvent,
     PeerGameDB,
     PeerRuntimeHandle,
+    PeerStartOptions,
     UnpackFuture,
     Unpacker,
-    start_peer,
+    migrate_legacy_state,
+    start_peer_with_options,
 };
 use tauri::{AppHandle, Emitter as _, Manager};
 use tauri_plugin_shell::{ShellExt, process::Command};
@@ -42,6 +42,8 @@ struct LanSpreadState {
     peer_game_db: Arc<RwLock<PeerGameDB>>,
     catalog: Arc<RwLock<HashSet<String>>>,
     unpack_logs: Arc<RwLock<Vec<UnpackLogEntry>>>,
+    pending_install_account_names: Arc<RwLock<HashMap<String, String>>>,
+    state_dir: OnceLock<PathBuf>,
 }
 
 struct PeerEventTx(UnboundedSender<PeerEvent>);
@@ -63,11 +65,18 @@ struct UiActiveOperation {
 
 #[derive(Clone, Debug, serde::Serialize)]
 struct GamesListPayload {
-    games: Vec<Game>,
+    games: Vec<LauncherGame>,
     active_operations: Vec<UiActiveOperation>,
 }
 
 #[derive(Clone, Debug, serde::Serialize)]
+struct LauncherGame {
+    #[serde(flatten)]
+    game: Game,
+    can_host_server: bool,
+}
+
+#[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
 struct UnpackLogEntry {
     archive: String,
     destination: String,
@@ -83,7 +92,8 @@ struct SidecarUnpacker {
     app_handle: AppHandle,
 }
 
-const MAX_UNPACK_LOGS: usize = 100;
+const MAX_UNPACK_LOGS: usize = 20;
+const UNPACK_LOGS_FILE_NAME: &str = "unpack-logs.json";
 
 impl Unpacker for SidecarUnpacker {
     fn unpack<'a>(&'a self, archive: &'a Path, dest: &'a Path) -> UnpackFuture<'a> {
@@ -102,8 +112,17 @@ async fn get_unpack_logs(
     Ok(state.inner().unpack_logs.read().await.clone())
 }
 
-#[cfg(target_os = "windows")]
-const FIRST_START_DONE_FILE: &str = ".softlan_first_start_done";
+#[cfg_attr(not(target_os = "windows"), allow(dead_code))]
+const GAME_SETUP_SCRIPT: &str = "game_setup.cmd";
+#[cfg_attr(not(target_os = "windows"), allow(dead_code))]
+const GAME_START_SCRIPT: &str = "game_start.cmd";
+const SERVER_START_SCRIPT: &str = "server_start.cmd";
+#[cfg_attr(not(target_os = "windows"), allow(dead_code))]
+const DEFAULT_LANGUAGE: &str = "en";
+#[cfg_attr(not(target_os = "windows"), allow(dead_code))]
+const DEFAULT_USERNAME: &str = "Commander";
+#[cfg_attr(not(target_os = "windows"), allow(dead_code))]
+const MAX_USERNAME_CHARS: usize = 24;
 
 #[tauri::command]
 async fn request_games(state: tauri::State<'_, LanSpreadState>) -> tauri::Result<()> {
@@ -124,7 +143,11 @@ async fn request_games(state: tauri::State<'_, LanSpreadState>) -> tauri::Result
 }
 
 #[tauri::command]
-async fn install_game(id: String, state: tauri::State<'_, LanSpreadState>) -> tauri::Result<bool> {
+async fn install_game(
+    id: String,
+    username: String,
+    state: tauri::State<'_, LanSpreadState>,
+) -> tauri::Result<bool> {
     if state
         .inner()
         .active_operations
@@ -150,11 +173,21 @@ async fn install_game(id: String, state: tauri::State<'_, LanSpreadState>) -> ta
         return Ok(false);
     };
 
+    let account_name = sanitize_username(&username);
     let handled = if let Some(peer_ctrl) = peer_ctrl {
         let command = if !downloaded {
-            PeerCommand::GetGame(id)
+            state
+                .inner()
+                .pending_install_account_names
+                .write()
+                .await
+                .insert(id.clone(), account_name);
+            PeerCommand::GetGame(id.clone())
         } else if !installed {
-            PeerCommand::InstallGame { id }
+            PeerCommand::InstallGame {
+                id: id.clone(),
+                account_name: Some(account_name),
+            }
         } else {
             log::info!("Game is already installed: {id}");
             return Ok(false);
@@ -162,6 +195,13 @@ async fn install_game(id: String, state: tauri::State<'_, LanSpreadState>) -> ta
 
         if let Err(e) = peer_ctrl.send(command) {
             log::error!("Failed to send message to peer: {e:?}");
+            state
+                .inner()
+                .pending_install_account_names
+                .write()
+                .await
+                .remove(&id);
+            return Ok(false);
         }
         true
     } else {
@@ -173,7 +213,11 @@ async fn install_game(id: String, state: tauri::State<'_, LanSpreadState>) -> ta
 }
 
 #[tauri::command]
-async fn update_game(id: String, state: tauri::State<'_, LanSpreadState>) -> tauri::Result<bool> {
+async fn update_game(
+    id: String,
+    username: String,
+    state: tauri::State<'_, LanSpreadState>,
+) -> tauri::Result<bool> {
     if state
         .inner()
         .active_operations
@@ -190,8 +234,20 @@ async fn update_game(id: String, state: tauri::State<'_, LanSpreadState>) -> tau
     let peer_ctrl = peer_ctrl_arc.read().await.clone();
 
     if let Some(peer_ctrl) = peer_ctrl {
-        if let Err(e) = peer_ctrl.send(PeerCommand::FetchLatestFromPeers { id }) {
+        state
+            .inner()
+            .pending_install_account_names
+            .write()
+            .await
+            .insert(id.clone(), sanitize_username(&username));
+        if let Err(e) = peer_ctrl.send(PeerCommand::FetchLatestFromPeers { id: id.clone() }) {
             log::error!("Failed to send message to peer: {e:?}");
+            state
+                .inner()
+                .pending_install_account_names
+                .write()
+                .await
+                .remove(&id);
             return Ok(false);
         }
         Ok(true)
@@ -284,6 +340,13 @@ async fn cancel_download(
     id: String,
     state: tauri::State<'_, LanSpreadState>,
 ) -> tauri::Result<bool> {
+    state
+        .inner()
+        .pending_install_account_names
+        .write()
+        .await
+        .remove(&id);
+
     let is_active_download = {
         let active_operations = state.inner().active_operations.read().await;
         matches!(
@@ -381,6 +444,72 @@ fn is_single_component_game_id(id: &str) -> bool {
     matches!(components.next(), Some(Component::Normal(_))) && components.next().is_none()
 }
 
+#[derive(Clone, Debug, PartialEq, Eq)]
+#[cfg_attr(not(target_os = "windows"), allow(dead_code))]
+struct LaunchSettings {
+    language: String,
+    username: String,
+}
+
+#[cfg_attr(not(target_os = "windows"), allow(dead_code))]
+fn launch_settings(language: &str, username: &str) -> LaunchSettings {
+    LaunchSettings {
+        language: sanitize_language(language),
+        username: sanitize_username(username),
+    }
+}
+
+#[cfg_attr(not(target_os = "windows"), allow(dead_code))]
+fn sanitize_language(language: &str) -> String {
+    match language.trim().to_ascii_lowercase().as_str() {
+        "de" => "de".to_string(),
+        "en" => "en".to_string(),
+        _ => DEFAULT_LANGUAGE.to_string(),
+    }
+}
+
+#[cfg_attr(not(target_os = "windows"), allow(dead_code))]
+fn sanitize_username(username: &str) -> String {
+    let cleaned = username
+        .trim()
+        .chars()
+        .filter(|c| !c.is_control() && *c != '"' && *c != '%')
+        .take(MAX_USERNAME_CHARS)
+        .collect::<String>();
+
+    if cleaned.is_empty() {
+        DEFAULT_USERNAME.to_string()
+    } else {
+        cleaned
+    }
+}
+
+#[cfg_attr(not(target_os = "windows"), allow(dead_code))]
+fn script_params(script_path: &Path, id: &str, settings: &LaunchSettings) -> String {
+    script_params_with_mode("/c", script_path, id, settings)
+}
+
+#[cfg_attr(not(target_os = "windows"), allow(dead_code))]
+fn server_script_params(script_path: &Path, id: &str, settings: &LaunchSettings) -> String {
+    script_params_with_mode("/k", script_path, id, settings)
+}
+
+#[cfg_attr(not(target_os = "windows"), allow(dead_code))]
+fn script_params_with_mode(
+    cmd_mode: &str,
+    script_path: &Path,
+    id: &str,
+    settings: &LaunchSettings,
+) -> String {
+    format!(
+        r#"/d /s {cmd_mode} ""{}" "local" "{}" "{}" "{}"""#,
+        script_path.display(),
+        id,
+        settings.language,
+        settings.username,
+    )
+}
+
 #[tauri::command]
 async fn get_peer_count(state: tauri::State<'_, LanSpreadState>) -> tauri::Result<usize> {
     let peer_ctrl_arc = state.inner().peer_ctrl.clone();
@@ -418,7 +547,12 @@ async fn get_game_thumbnail(
 }
 
 #[cfg(target_os = "windows")]
-fn run_as_admin(file: &str, params: &str, dir: &str) -> bool {
+fn run_as_admin(
+    file: &str,
+    params: &str,
+    dir: &str,
+    show_cmd: windows::Win32::UI::WindowsAndMessaging::SHOW_WINDOW_CMD,
+) -> bool {
     use std::{ffi::OsStr, os::windows::ffi::OsStrExt};
 
     use windows::{Win32::UI::Shell::ShellExecuteW, core::PCWSTR};
@@ -435,7 +569,7 @@ fn run_as_admin(file: &str, params: &str, dir: &str) -> bool {
             PCWSTR::from_raw(file_wide.as_ptr()),
             PCWSTR::from_raw(params_wide.as_ptr()),
             PCWSTR::from_raw(dir_wide.as_ptr()),
-            windows::Win32::UI::WindowsAndMessaging::SW_HIDE,
+            show_cmd,
         )
     };
 
@@ -445,8 +579,16 @@ fn run_as_admin(file: &str, params: &str, dir: &str) -> bool {
 #[cfg(target_os = "windows")]
 async fn run_game_windows(
     id: String,
+    language: String,
+    username: String,
     state: tauri::State<'_, LanSpreadState>,
 ) -> tauri::Result<()> {
+    if !is_single_component_game_id(&id) {
+        log::warn!("Ignoring run request for invalid game id: {id}");
+        return Ok(());
+    }
+
+    let settings = launch_settings(&language, &username);
     let games_folder_lock = state.inner().games_folder.clone();
     let games_folder = {
         let guard = games_folder_lock.read().await;
@@ -461,11 +603,15 @@ async fn run_game_windows(
 
     let game_path = games_folder.join(id.clone());
 
-    let game_setup_bin = game_path.join("game_setup.cmd");
-    let game_start_bin = game_path.join("game_start.cmd");
+    let game_setup_bin = game_path.join(GAME_SETUP_SCRIPT);
+    let game_start_bin = game_path.join(GAME_START_SCRIPT);
+    let Some(state_dir) = state.inner().state_dir.get().cloned() else {
+        log::error!("app state directory is not initialized; cannot run game");
+        return Ok(());
+    };
 
-    let first_start_done_file = game_path.join("local").join(FIRST_START_DONE_FILE);
-    if !first_start_done_file.exists() && game_setup_bin.exists() {
+    let setup_done_file = lanspread_peer::setup_done_path(&state_dir, &id);
+    if !setup_done_file.exists() && game_setup_bin.exists() {
         if !local_install_is_present(&game_path) {
             log::warn!(
                 "local install is missing for {}; skipping game_setup",
@@ -476,23 +622,29 @@ async fn run_game_windows(
 
         let result = run_as_admin(
             "cmd.exe",
-            &format!(
-                r#"/c "{} local {} de playername""#,
-                game_setup_bin.display(),
-                &id
-            ),
+            &script_params(&game_setup_bin, &id, &settings),
             &game_path.display().to_string(),
+            windows::Win32::UI::WindowsAndMessaging::SW_HIDE,
         );
 
         if !result {
-            log::error!("failed to run game_setup.cmd");
+            log::error!("failed to run {GAME_SETUP_SCRIPT}");
             return Ok(());
         }
 
-        if let Err(e) = File::create(&first_start_done_file) {
+        if let Some(parent) = setup_done_file.parent()
+            && let Err(e) = std::fs::create_dir_all(parent)
+        {
             log::error!(
-                "failed to create first-start marker {}: {e}",
-                first_start_done_file.display()
+                "failed to create setup marker directory {}: {e}",
+                parent.display()
+            );
+        }
+
+        if let Err(e) = std::fs::File::create(&setup_done_file) {
+            log::error!(
+                "failed to create setup marker {}: {e}",
+                setup_done_file.display()
             );
         }
     }
@@ -500,16 +652,13 @@ async fn run_game_windows(
     if game_start_bin.exists() {
         let result = run_as_admin(
             "cmd.exe",
-            &format!(
-                r#"/c "{} local {} de playername""#,
-                game_start_bin.display(),
-                &id
-            ),
+            &script_params(&game_start_bin, &id, &settings),
             &game_path.display().to_string(),
+            windows::Win32::UI::WindowsAndMessaging::SW_HIDE,
         );
 
         if !result {
-            log::error!("failed to run game_start.cmd");
+            log::error!("failed to run {GAME_START_SCRIPT}");
         }
     }
 
@@ -517,21 +666,98 @@ async fn run_game_windows(
 }
 
 #[tauri::command]
-async fn run_game(id: String, state: tauri::State<'_, LanSpreadState>) -> tauri::Result<()> {
+async fn run_game(
+    id: String,
+    language: String,
+    username: String,
+    state: tauri::State<'_, LanSpreadState>,
+) -> tauri::Result<()> {
     #[cfg(target_os = "windows")]
     {
-        run_game_windows(id, state).await?;
+        run_game_windows(id, language, username, state).await?;
     }
 
     #[cfg(not(target_os = "windows"))]
     {
-        let _ = state;
+        let _ = (state, language, username);
         log::error!("run_game not implemented for this platform: id={id}");
     }
 
     Ok(())
 }
 
+#[cfg(target_os = "windows")]
+async fn start_server_windows(
+    id: String,
+    language: String,
+    username: String,
+    state: tauri::State<'_, LanSpreadState>,
+) -> tauri::Result<bool> {
+    if !is_single_component_game_id(&id) {
+        log::warn!("Ignoring server start request for invalid game id: {id}");
+        return Ok(false);
+    }
+
+    let settings = launch_settings(&language, &username);
+    let games_folder = PathBuf::from(state.inner().games_folder.read().await.clone());
+    if !games_folder.exists() {
+        log::error!("games_folder {} does not exist", games_folder.display());
+        return Ok(false);
+    }
+
+    let game_path = games_folder.join(id.clone());
+    if !local_install_is_present(&game_path) {
+        log::warn!(
+            "local install is missing for {}; skipping {SERVER_START_SCRIPT}",
+            game_path.display()
+        );
+        return Ok(false);
+    }
+
+    let server_start_bin = game_path.join(SERVER_START_SCRIPT);
+    if !server_start_bin.is_file() {
+        log::warn!(
+            "server start script is missing for {}: {}",
+            id,
+            server_start_bin.display()
+        );
+        return Ok(false);
+    }
+
+    let result = run_as_admin(
+        "cmd.exe",
+        &server_script_params(&server_start_bin, &id, &settings),
+        &game_path.display().to_string(),
+        windows::Win32::UI::WindowsAndMessaging::SW_SHOWNORMAL,
+    );
+
+    if !result {
+        log::error!("failed to run {SERVER_START_SCRIPT}");
+    }
+
+    Ok(result)
+}
+
+#[tauri::command]
+async fn start_server(
+    id: String,
+    language: String,
+    username: String,
+    state: tauri::State<'_, LanSpreadState>,
+) -> tauri::Result<bool> {
+    #[cfg(target_os = "windows")]
+    {
+        start_server_windows(id, language, username, state).await
+    }
+
+    #[cfg(not(target_os = "windows"))]
+    {
+        let _ = (state, language, username);
+        log::error!("start_server not implemented for this platform: id={id}");
+        Ok(false)
+    }
+}
+
 #[cfg(target_os = "windows")]
 fn local_install_is_present(game_path: &Path) -> bool {
     game_path.join("local").is_dir()
@@ -592,6 +818,7 @@ async fn emit_games_list(app_handle: &AppHandle) {
 
     let games_db_lock = state.games.clone();
     let game_db = games_db_lock.read().await;
+    let games_folder = state.games_folder.read().await.clone();
 
     if game_db.games.is_empty() {
         log::debug!("Game database empty; skipping emit");
@@ -602,7 +829,11 @@ async fn emit_games_list(app_handle: &AppHandle) {
         .all_games()
         .into_iter()
         .cloned()
-        .collect::<Vec<Game>>();
+        .map(|game| LauncherGame {
+            can_host_server: game_can_host_server(&games_folder, &game),
+            game,
+        })
+        .collect::<Vec<LauncherGame>>();
 
     drop(game_db);
 
@@ -623,6 +854,17 @@ async fn emit_games_list(app_handle: &AppHandle) {
     }
 }
 
+fn game_can_host_server(games_folder: &str, game: &Game) -> bool {
+    if !game.installed || games_folder.is_empty() || !is_single_component_game_id(&game.id) {
+        return false;
+    }
+
+    PathBuf::from(games_folder)
+        .join(&game.id)
+        .join(SERVER_START_SCRIPT)
+        .is_file()
+}
+
 fn ui_active_operations_from_map(
     active_operations: &HashMap<String, UiOperationKind>,
 ) -> Vec<UiActiveOperation> {
@@ -660,6 +902,11 @@ fn ui_operation_from_peer(operation: ActiveOperationKind) -> UiOperationKind {
     }
 }
 
+#[tauri::command]
+fn game_directory_exists(path: String) -> bool {
+    PathBuf::from(path).is_dir()
+}
+
 #[tauri::command]
 async fn update_game_directory(app_handle: tauri::AppHandle, path: String) -> tauri::Result<()> {
     log::info!("update_game_directory: {path}");
@@ -689,6 +936,21 @@ async fn update_game_directory(app_handle: tauri::AppHandle, path: String) -> ta
     }
 
     let path_changed = current_path != path;
+    let Some(state_dir) = state.state_dir.get().cloned() else {
+        log::error!("app state directory is not initialized; cannot update game directory");
+        return Ok(());
+    };
+
+    if path_changed || state.peer_ctrl.read().await.is_none() {
+        let migration = migrate_legacy_state(&games_folder, &state_dir).await;
+        if migration.failures > 0 {
+            log::warn!(
+                "Legacy state migration completed with {} failure(s)",
+                migration.failures
+            );
+        }
+    }
+
     *state.games_folder.write().await = path;
 
     ensure_bundled_game_db_loaded(&app_handle).await;
@@ -904,8 +1166,8 @@ async fn run_unrar_sidecar(
         }
     };
 
-    let stdout = String::from_utf8_lossy(&out.stdout).into_owned();
-    let stderr = String::from_utf8_lossy(&out.stderr).into_owned();
+    let stdout = clean_terminal_log(&String::from_utf8_lossy(&out.stdout));
+    let stderr = clean_terminal_log(&String::from_utf8_lossy(&out.stderr));
     let status_code = out.status.code();
     let success = out.status.success();
 
@@ -962,20 +1224,120 @@ async fn record_unpack_failure(
 
 async fn record_unpack_log(app_handle: &AppHandle, entry: UnpackLogEntry) {
     let state = app_handle.state::<LanSpreadState>();
-    {
+    let mut entry = entry;
+    clean_unpack_log_entry(&mut entry);
+    let logs = {
         let mut logs = state.inner().unpack_logs.write().await;
         logs.push(entry);
-        if logs.len() > MAX_UNPACK_LOGS {
-            let overflow = logs.len() - MAX_UNPACK_LOGS;
-            logs.drain(..overflow);
-        }
-    }
+        trim_unpack_logs(&mut logs);
+        logs.clone()
+    };
+
+    persist_unpack_logs(app_handle, &logs).await;
 
     if let Err(err) = app_handle.emit("unpack-logs-updated", ()) {
         log::warn!("Failed to emit unpack-logs-updated event: {err}");
     }
 }
 
+fn trim_unpack_logs(logs: &mut Vec<UnpackLogEntry>) {
+    if logs.len() > MAX_UNPACK_LOGS {
+        let overflow = logs.len() - MAX_UNPACK_LOGS;
+        logs.drain(..overflow);
+    }
+}
+
+fn clean_unpack_log_entry(entry: &mut UnpackLogEntry) {
+    let stdout = clean_terminal_log(&entry.stdout);
+    let stderr = clean_terminal_log(&entry.stderr);
+    entry.stdout = stdout;
+    entry.stderr = stderr;
+}
+
+fn clean_terminal_log(input: &str) -> String {
+    let mut output = String::new();
+    let mut line = String::new();
+    let mut chars = input.chars().peekable();
+
+    while let Some(ch) = chars.next() {
+        match ch {
+            '\r' if chars.peek() == Some(&'\n') => {
+                let _ = chars.next();
+                output.push_str(&line);
+                output.push('\n');
+                line.clear();
+            }
+            '\r' => {
+                line.clear();
+            }
+            '\n' => {
+                output.push_str(&line);
+                output.push('\n');
+                line.clear();
+            }
+            '\u{8}' => {
+                let _ = line.pop();
+            }
+            '\t' => line.push(ch),
+            ch if ch.is_control() => {}
+            ch => line.push(ch),
+        }
+    }
+
+    output.push_str(&line);
+    output
+}
+
+fn unpack_logs_path(state_dir: &Path) -> PathBuf {
+    state_dir.join(UNPACK_LOGS_FILE_NAME)
+}
+
+fn load_unpack_logs(state_dir: &Path) -> Vec<UnpackLogEntry> {
+    let path = unpack_logs_path(state_dir);
+    let contents = match std::fs::read_to_string(&path) {
+        Ok(contents) => contents,
+        Err(err) if err.kind() == std::io::ErrorKind::NotFound => return Vec::new(),
+        Err(err) => {
+            log::warn!("Failed to read unpack logs from {}: {err}", path.display());
+            return Vec::new();
+        }
+    };
+
+    let mut logs = match serde_json::from_str::<Vec<UnpackLogEntry>>(&contents) {
+        Ok(logs) => logs,
+        Err(err) => {
+            log::warn!("Failed to parse unpack logs from {}: {err}", path.display());
+            return Vec::new();
+        }
+    };
+    logs.iter_mut().for_each(clean_unpack_log_entry);
+    trim_unpack_logs(&mut logs);
+    logs
+}
+
+async fn persist_unpack_logs(app_handle: &AppHandle, logs: &[UnpackLogEntry]) {
+    let state = app_handle.state::<LanSpreadState>();
+    let Some(state_dir) = state.state_dir.get().cloned() else {
+        log::warn!("Cannot persist unpack logs before app state directory is initialized");
+        return;
+    };
+    let path = unpack_logs_path(&state_dir);
+    let contents = match serde_json::to_vec_pretty(logs) {
+        Ok(contents) => contents,
+        Err(err) => {
+            log::warn!(
+                "Failed to serialize unpack logs for {}: {err}",
+                path.display()
+            );
+            return;
+        }
+    };
+
+    if let Err(err) = tokio::fs::write(&path, contents).await {
+        log::warn!("Failed to persist unpack logs to {}: {err}", path.display());
+    }
+}
+
 fn now_millis() -> u64 {
     SystemTime::now()
         .duration_since(UNIX_EPOCH)
@@ -1032,16 +1394,23 @@ async fn ensure_peer_started(app_handle: &AppHandle, games_folder: &Path) {
         return;
     }
 
+    let Some(state_dir) = state.state_dir.get().cloned() else {
+        log::error!("app state directory is not initialized; cannot start peer");
+        return;
+    };
     let tx_peer_event = app_handle.state::<PeerEventTx>().inner().0.clone();
     let unpacker = Arc::new(SidecarUnpacker {
         app_handle: app_handle.clone(),
     });
-    match start_peer(
+    match start_peer_with_options(
         games_folder.to_path_buf(),
         tx_peer_event,
         state.peer_game_db.clone(),
         unpacker,
         state.catalog.clone(),
+        PeerStartOptions {
+            state_dir: Some(state_dir),
+        },
     ) {
         Ok(handle) => {
             let sender = handle.sender();
@@ -1112,6 +1481,7 @@ async fn handle_peer_event(app_handle: &AppHandle, event: PeerEvent) {
         }
         PeerEvent::NoPeersHaveGame { id } => {
             log::warn!("PeerEvent::NoPeersHaveGame received for {id}");
+            clear_pending_install_account_name(app_handle, &id).await;
             emit_game_id_event(
                 app_handle,
                 "game-no-peers",
@@ -1150,6 +1520,7 @@ async fn handle_peer_event(app_handle: &AppHandle, event: PeerEvent) {
         }
         PeerEvent::DownloadGameFilesFailed { id } => {
             log::warn!("PeerEvent::DownloadGameFilesFailed received");
+            clear_pending_install_account_name(app_handle, &id).await;
             emit_game_id_event(
                 app_handle,
                 "game-download-failed",
@@ -1159,6 +1530,7 @@ async fn handle_peer_event(app_handle: &AppHandle, event: PeerEvent) {
         }
         PeerEvent::DownloadGameFilesAllPeersGone { id } => {
             log::warn!("PeerEvent::DownloadGameFilesAllPeersGone received for {id}");
+            clear_pending_install_account_name(app_handle, &id).await;
             emit_game_id_event(
                 app_handle,
                 "game-download-peers-gone",
@@ -1283,6 +1655,11 @@ async fn handle_peer_event(app_handle: &AppHandle, event: PeerEvent) {
     }
 }
 
+async fn clear_pending_install_account_name(app_handle: &AppHandle, id: &str) {
+    let state = app_handle.state::<LanSpreadState>();
+    state.pending_install_account_names.write().await.remove(id);
+}
+
 async fn handle_got_game_files(
     app_handle: &AppHandle,
     id: String,
@@ -1297,11 +1674,17 @@ async fn handle_got_game_files(
     );
 
     let state = app_handle.state::<LanSpreadState>();
+    let account_name = state
+        .pending_install_account_names
+        .write()
+        .await
+        .remove(&id);
     let peer_ctrl = state.peer_ctrl.read().await.clone();
     if let Some(peer_ctrl) = peer_ctrl
         && let Err(e) = peer_ctrl.send(PeerCommand::DownloadGameFiles {
             id,
             file_descriptions,
+            account_name,
         })
     {
         log::error!("Failed to send PeerCommand::DownloadGameFiles: {e}");
@@ -1322,6 +1705,20 @@ fn handle_download_finished(app_handle: &AppHandle, id: String) {
 mod tests {
     use super::*;
 
+    fn unpack_log_fixture(index: usize) -> UnpackLogEntry {
+        let timestamp = u64::try_from(index).unwrap_or(u64::MAX);
+        UnpackLogEntry {
+            archive: format!("archive-{index}.rar"),
+            destination: format!("destination-{index}"),
+            status_code: Some(0),
+            stdout: format!("stdout {index}"),
+            stderr: String::new(),
+            started_at_ms: timestamp,
+            finished_at_ms: timestamp,
+            success: true,
+        }
+    }
+
     fn game_fixture(id: &str, name: &str) -> Game {
         Game {
             id: id.to_string(),
@@ -1342,6 +1739,72 @@ mod tests {
         }
     }
 
+    #[test]
+    fn terminal_log_cleanup_preserves_crlf_and_collapses_redrawn_lines() {
+        let input = "Extracting foo 10%\rExtracting foo 80%\rExtracting foo OK\r\nAll done\r\n";
+
+        assert_eq!(clean_terminal_log(input), "Extracting foo OK\nAll done\n");
+    }
+
+    #[test]
+    fn terminal_log_cleanup_applies_backspaces() {
+        assert_eq!(clean_terminal_log("abc\u{8}\u{8}de\n"), "ade\n");
+    }
+
+    #[test]
+    fn terminal_log_cleanup_removes_other_controls() {
+        assert_eq!(clean_terminal_log("a\u{7}b\tc"), "ab\tc");
+    }
+
+    #[test]
+    fn unpack_log_retention_keeps_last_twenty_entries() {
+        let mut logs = (0..25).map(unpack_log_fixture).collect::<Vec<_>>();
+
+        trim_unpack_logs(&mut logs);
+
+        assert_eq!(logs.len(), MAX_UNPACK_LOGS);
+        assert_eq!(
+            logs.first().map(|entry| entry.archive.as_str()),
+            Some("archive-5.rar")
+        );
+        assert_eq!(
+            logs.last().map(|entry| entry.archive.as_str()),
+            Some("archive-24.rar")
+        );
+    }
+
+    #[test]
+    fn unpack_logs_load_from_app_state_dir_and_apply_retention() {
+        let root = std::env::temp_dir().join(format!(
+            "lanspread-unpack-logs-test-{}",
+            SystemTime::now()
+                .duration_since(UNIX_EPOCH)
+                .expect("clock should be after epoch")
+                .as_nanos()
+        ));
+        std::fs::create_dir_all(&root).expect("test state dir should be created");
+        let logs = (0..25).map(unpack_log_fixture).collect::<Vec<_>>();
+        std::fs::write(
+            unpack_logs_path(&root),
+            serde_json::to_vec(&logs).expect("logs should serialize"),
+        )
+        .expect("logs should be written");
+
+        let loaded = load_unpack_logs(&root);
+
+        assert_eq!(loaded.len(), MAX_UNPACK_LOGS);
+        assert_eq!(
+            loaded.first().map(|entry| entry.archive.as_str()),
+            Some("archive-5.rar")
+        );
+        assert_eq!(
+            loaded.last().map(|entry| entry.archive.as_str()),
+            Some("archive-24.rar")
+        );
+
+        let _ = std::fs::remove_dir_all(root);
+    }
+
     #[test]
     fn active_operation_reconciliation_replaces_stale_ui_history() {
         let mut active_operations = HashMap::from([
@@ -1440,6 +1903,84 @@ mod tests {
         assert!(!is_single_component_game_id("/game"));
     }
 
+    #[test]
+    fn launch_settings_sanitize_script_arguments() {
+        assert_eq!(
+            launch_settings("DE", "  Alice \"Ace\"%PATH%\n  "),
+            LaunchSettings {
+                language: "de".to_string(),
+                username: "Alice AcePATH".to_string(),
+            }
+        );
+        assert_eq!(
+            launch_settings("fr", ""),
+            LaunchSettings {
+                language: DEFAULT_LANGUAGE.to_string(),
+                username: DEFAULT_USERNAME.to_string(),
+            }
+        );
+    }
+
+    #[test]
+    fn script_params_use_common_argument_shape() {
+        let start_params = script_params(
+            Path::new("C:/Games/My Game")
+                .join(GAME_START_SCRIPT)
+                .as_path(),
+            "my-game",
+            &LaunchSettings {
+                language: "en".to_string(),
+                username: "Alice".to_string(),
+            },
+        );
+
+        assert_eq!(
+            start_params,
+            r#"/d /s /c ""C:/Games/My Game/game_start.cmd" "local" "my-game" "en" "Alice"""#
+        );
+
+        let server_params = server_script_params(
+            Path::new("C:/Games/My Game")
+                .join(SERVER_START_SCRIPT)
+                .as_path(),
+            "my-game",
+            &LaunchSettings {
+                language: "en".to_string(),
+                username: "Alice".to_string(),
+            },
+        );
+
+        assert_eq!(
+            server_params,
+            r#"/d /s /k ""C:/Games/My Game/server_start.cmd" "local" "my-game" "en" "Alice"""#
+        );
+    }
+
+    #[test]
+    fn server_host_capability_requires_installed_game_with_script() {
+        let root = std::env::temp_dir().join(format!(
+            "lanspread-server-test-{}",
+            SystemTime::now()
+                .duration_since(UNIX_EPOCH)
+                .expect("clock should be after epoch")
+                .as_nanos()
+        ));
+        let game_root = root.join("game");
+        std::fs::create_dir_all(&game_root).expect("game root should be created");
+        std::fs::write(game_root.join(SERVER_START_SCRIPT), b"").expect("script should be written");
+
+        let mut game = game_fixture("game", "Game");
+        assert!(!game_can_host_server(
+            root.to_string_lossy().as_ref(),
+            &game
+        ));
+
+        game.installed = true;
+        assert!(game_can_host_server(root.to_string_lossy().as_ref(), &game));
+
+        let _ = std::fs::remove_dir_all(root);
+    }
+
     #[test]
     fn peer_local_snapshot_replaces_local_state_without_overwriting_catalog_metadata() {
         let mut alpha = game_fixture("alpha", "Catalog Alpha");
@@ -1506,6 +2047,8 @@ pub fn run() {
             request_games,
             install_game,
             run_game,
+            start_server,
+            game_directory_exists,
             update_game_directory,
             update_game,
             uninstall_game,
@@ -1519,6 +2062,16 @@ pub fn run() {
         .manage(LanSpreadState::default())
         .manage(PeerEventTx(tx_peer_event))
         .setup(move |app| {
+            let state_dir = app.path().app_data_dir()?;
+            std::fs::create_dir_all(&state_dir)?;
+            let state = app.state::<LanSpreadState>();
+            let unpack_logs = load_unpack_logs(&state_dir);
+            tauri::async_runtime::block_on(async {
+                *state.unpack_logs.write().await = unpack_logs;
+            });
+            if state.state_dir.set(state_dir).is_err() {
+                log::warn!("app state directory was already initialized");
+            }
             spawn_peer_event_loop(app.handle().clone(), rx_peer_event);
             Ok(())
         })

crates/lanspread-tauri-deno-ts/src/UnpackLogsWindow.tsx

@@ -33,6 +33,9 @@ const formatLogTime = (timestampMs: number): string => {
     return new Date(timestampMs).toLocaleString();
 };
 
+const logSortTime = (entry: UnpackLogEntry): number =>
+    entry.finished_at_ms > 0 ? entry.finished_at_ms : entry.started_at_ms;
+
 const basename = (path: string): string => {
     const segments = path.split(/[\\/]/);
     return segments[segments.length - 1] || path;
@@ -97,6 +100,10 @@ export const UnpackLogsWindow = () => {
 
             out.push({ entry, originalIndex, stdoutLines, stderrLines, matchCount });
         });
+        out.sort((a, b) => {
+            const timestampDelta = logSortTime(b.entry) - logSortTime(a.entry);
+            return timestampDelta !== 0 ? timestampDelta : b.originalIndex - a.originalIndex;
+        });
         return out;
     }, [logs, errorsOnly, regex]);
 

crates/lanspread-tauri-deno-ts/src/components/Icon.tsx

@@ -21,6 +21,15 @@ export const Icon = {
             <path d="M4 2.5v11l10-5.5z" />
         </svg>
     ),
+    server: (p: Props) => (
+        <svg viewBox="0 0 16 16" width="13" height="13" strokeWidth={1.5} {...baseStroke} {...p}>
+            <rect x="2" y="3" width="12" height="4.5" rx="1" />
+            <rect x="2" y="8.5" width="12" height="4.5" rx="1" />
+            <circle cx="4.6" cy="5.25" r=".55" fill="currentColor" stroke="none" />
+            <circle cx="4.6" cy="10.75" r=".55" fill="currentColor" stroke="none" />
+            <path d="M7 5.25h4.5M7 10.75h4.5" />
+        </svg>
+    ),
     install: (p: Props) => (
         <svg viewBox="0 0 16 16" width="12" height="12" strokeWidth={1.7} {...baseStroke} {...p}>
             <path d="M8 2v8" />

crates/lanspread-tauri-deno-ts/src/components/empty/NoDirectoryState.tsx

@@ -7,11 +7,7 @@ interface Props {
 export const NoDirectoryState = ({ onChooseDirectory }: Props) => (
     <div className="empty-state">
         <div className="empty-state-icon"><Icon.folder /></div>
-        <h2 className="empty-state-title">Pick a game directory</h2>
-        <p className="empty-state-hint">
-            SoftLAN scans the folder you point it at for installable game bundles
-            and tracks what your peers on the LAN have available.
-        </p>
+        <h2 className="empty-state-title">Please select a game folder</h2>
         <button type="button" className="ghost-btn" onClick={onChooseDirectory}>
             <Icon.folder />
             <span>Choose folder</span>

crates/lanspread-tauri-deno-ts/src/components/modals/GameDetailModal.tsx

@@ -16,6 +16,7 @@ interface Props {
     onUninstall: (game: Game) => void;
     onRemoveDownload: (game: Game) => void;
     onCancelDownload: (game: Game) => void;
+    onStartServer: (game: Game) => void;
     onViewFiles: (game: Game) => void;
 }
 
@@ -45,6 +46,7 @@ export const GameDetailModal = ({
     onUninstall,
     onRemoveDownload,
     onCancelDownload,
+    onStartServer,
     onViewFiles,
 }: Props) => {
     const tags = tagsFromGame(game);
@@ -53,7 +55,8 @@ export const GameDetailModal = ({
         && !isInProgress(game.install_status);
     const canViewFiles = game.downloaded
         || game.installed
-        || game.install_status === InstallStatus.Downloading;
+        || game.install_status === InstallStatus.Downloading
+        || game.install_status === InstallStatus.Installing;
     return (
         <Modal onClose={onClose}>
             <button className="modal-close" type="button" onClick={onClose} aria-label="Close">
@@ -116,6 +119,16 @@ export const GameDetailModal = ({
                         onClick={() => onPrimary(game)}
                         onCancelDownload={onCancelDownload}
                     />
+                    {game.installed && game.can_host_server === true && (
+                        <button
+                            type="button"
+                            className="act-btn act-lg act-server"
+                            onClick={() => onStartServer(game)}
+                        >
+                            <Icon.server />
+                            <span className="act-label">Start Server</span>
+                        </button>
+                    )}
                     {game.installed && (
                         <button
                             type="button"

crates/lanspread-tauri-deno-ts/src/components/modals/SettingsDialog.tsx

@@ -8,15 +8,21 @@ import {
     ASPECT_OPTIONS,
     BG_OPTIONS,
     DENSITY_OPTIONS,
-    UISettings,
+    LANGUAGE_OPTIONS,
+    type UISettings,
 } from '../../hooks/useSettings';
 
 interface Props {
     settings: UISettings;
+    gameDir: string;
+    hasGameDirectory: boolean;
+    onPickDirectory: () => void;
     onChange: <K extends keyof UISettings>(key: K, value: UISettings[K]) => void;
     onClose: () => void;
 }
 
+const buildNr = import.meta.env.VITE_LANSPREAD_BUILD_NR;
+
 interface RowProps {
     label: string;
     hint: string;
@@ -33,7 +39,57 @@ const Row = ({ label, hint, children }: RowProps) => (
     </div>
 );
 
-export const SettingsDialog = ({ settings, onChange, onClose }: Props) => (
+interface TextInputProps {
+    value: string;
+    placeholder: string;
+    maxLength: number;
+    onChange: (value: string) => void;
+}
+
+const SettingsTextInput = ({ value, placeholder, maxLength, onChange }: TextInputProps) => (
+    <div className="settings-text">
+        <input
+            type="text"
+            value={value}
+            placeholder={placeholder}
+            maxLength={maxLength}
+            spellCheck={false}
+            onChange={(e) => onChange(e.target.value)}
+        />
+    </div>
+);
+
+interface GameFolderFieldProps {
+    path: string;
+    isValid: boolean;
+    onPickDirectory: () => void;
+}
+
+const GameFolderField = ({ path, isValid, onPickDirectory }: GameFolderFieldProps) => (
+    <div className={`folder-field ${isValid ? 'is-set' : 'is-unset'}`}>
+        <Icon.folder className="folder-field-icon" aria-hidden="true" />
+        <div className="folder-field-path" title={isValid ? path : 'No folder selected'}>
+            {isValid ? <bdi>{path}</bdi> : <span className="folder-field-empty">Not set</span>}
+        </div>
+        <button
+            type="button"
+            className="folder-field-btn"
+            aria-label={isValid ? 'Change game folder' : 'Choose game folder'}
+            onClick={onPickDirectory}
+        >
+            {isValid ? 'Change…' : 'Choose…'}
+        </button>
+    </div>
+);
+
+export const SettingsDialog = ({
+    settings,
+    gameDir,
+    hasGameDirectory,
+    onPickDirectory,
+    onChange,
+    onClose,
+}: Props) => (
     <Modal onClose={onClose} className="settings-modal">
         <div className="settings-head">
             <h2>Settings</h2>
@@ -48,6 +104,25 @@ export const SettingsDialog = ({ settings, onChange, onClose }: Props) => (
         </div>
 
         <div className="settings-body">
+            <section className="settings-section">
+                <div className="settings-section-title">Profile</div>
+                <Row label="Username" hint="Shown to other players on the LAN">
+                    <SettingsTextInput
+                        value={settings.username}
+                        placeholder="Enter a username"
+                        maxLength={24}
+                        onChange={(v) => onChange('username', v)}
+                    />
+                </Row>
+                <Row label="Language" hint="Interface language">
+                    <SegmentedRadio
+                        value={settings.language}
+                        options={LANGUAGE_OPTIONS}
+                        onChange={(v) => onChange('language', v)}
+                    />
+                </Row>
+            </section>
+
             <section className="settings-section">
                 <div className="settings-section-title">Appearance</div>
                 <Row label="Accent color" hint="Used for primary actions and highlights">
@@ -68,6 +143,13 @@ export const SettingsDialog = ({ settings, onChange, onClose }: Props) => (
 
             <section className="settings-section">
                 <div className="settings-section-title">Library</div>
+                <Row label="Game folder" hint="Parent directory where games are downloaded and installed">
+                    <GameFolderField
+                        path={gameDir}
+                        isValid={hasGameDirectory}
+                        onPickDirectory={onPickDirectory}
+                    />
+                </Row>
                 <Row label="Grid density" hint="How tightly cards are packed">
                     <SegmentedRadio
                         value={settings.density}
@@ -86,6 +168,7 @@ export const SettingsDialog = ({ settings, onChange, onClose }: Props) => (
         </div>
 
         <div className="settings-foot">
+            <div className="settings-build-nr">Build-Nr: {buildNr}</div>
             <button type="button" className="settings-done" onClick={onClose}>Done</button>
         </div>
     </Modal>

crates/lanspread-tauri-deno-ts/src/components/topbar/DirectoryButton.tsx

@@ -1,17 +0,0 @@
-import { Icon } from '../Icon';
-import { truncatePath } from '../../lib/format';
-
-interface Props {
-    path: string;
-    onClick: () => void;
-}
-
-export const DirectoryButton = ({ path, onClick }: Props) => (
-    <button className="dirbtn" type="button" title={path || 'Choose a game directory'} onClick={onClick}>
-        <Icon.folder />
-        <span className="dirbtn-label">Game directory</span>
-        <span className="dirbtn-path">
-            {path ? truncatePath(path) : 'choose…'}
-        </span>
-    </button>
-);

crates/lanspread-tauri-deno-ts/src/components/topbar/SearchField.tsx

@@ -8,15 +8,18 @@ interface Props {
 }
 
 /**
- * Search input with a `/` keyboard shortcut for focus. Ignores the shortcut
- * when the user is already typing into another input or textarea.
+ * Search input with `/` and Ctrl+F keyboard shortcuts for focus. Ignores
+ * shortcuts when the user is already typing into another input or textarea.
  */
 export const SearchField = ({ value, onChange }: Props) => {
     const inputRef = useRef<HTMLInputElement | null>(null);
+    const clearClassName = value ? 'search-clear' : 'search-clear is-hidden';
 
     useEffect(() => {
         const onKey = (e: KeyboardEvent) => {
-            if (e.key !== '/') return;
+            const isFindShortcut = e.ctrlKey && !e.altKey && !e.shiftKey
+                && e.key.toLowerCase() === 'f';
+            if (e.key !== '/' && !isFindShortcut) return;
             const target = e.target as HTMLElement | null;
             if (target && (target.tagName === 'INPUT' || target.tagName === 'TEXTAREA')) return;
             e.preventDefault();
@@ -49,19 +52,19 @@ export const SearchField = ({ value, onChange }: Props) => {
                 }}
                 spellCheck={false}
             />
-            {value && (
-                <button
-                    className="search-clear"
-                    type="button"
-                    aria-label="Clear search"
-                    onClick={() => {
-                        onChange('');
-                        inputRef.current?.focus();
-                    }}
-                >
-                    <Icon.clearCircle />
-                </button>
-            )}
+            <button
+                className={clearClassName}
+                type="button"
+                aria-label="Clear search"
+                aria-hidden={value ? undefined : true}
+                disabled={!value}
+                onClick={() => {
+                    onChange('');
+                    inputRef.current?.focus();
+                }}
+            >
+                <Icon.clearCircle />
+            </button>
             <span className="search-kbd">/</span>
         </div>
     );

crates/lanspread-tauri-deno-ts/src/components/topbar/TopBar.tsx

@@ -2,7 +2,6 @@ import { Brand } from '../Brand';
 import { SegmentedFilters } from './SegmentedFilters';
 import { SearchField } from './SearchField';
 import { SortMenu } from './SortMenu';
-import { DirectoryButton } from './DirectoryButton';
 import { KebabMenu, KebabItem } from './KebabMenu';
 
 import { FilterCounts } from '../../lib/gameState';
@@ -17,8 +16,6 @@ interface Props {
     setQuery: (value: string) => void;
     sort: GameSort;
     setSort: (value: GameSort) => void;
-    gameDir: string;
-    onPickDirectory: () => void;
     kebabItems: ReadonlyArray<KebabItem>;
 }
 
@@ -31,16 +28,25 @@ export const TopBar = ({
     setQuery,
     sort,
     setSort,
-    gameDir,
-    onPickDirectory,
     kebabItems,
 }: Props) => (
     <header className="topbar">
-        <Brand peerCount={peerCount} />
-        <SegmentedFilters value={filter} onChange={setFilter} counts={counts} />
-        <SearchField value={query} onChange={setQuery} />
-        <SortMenu value={sort} onChange={setSort} />
-        <DirectoryButton path={gameDir} onClick={onPickDirectory} />
-        <KebabMenu items={kebabItems} />
+        <div className="topbar-left">
+            <Brand peerCount={peerCount} />
+            <div className="topbar-left-trail">
+                <SegmentedFilters value={filter} onChange={setFilter} counts={counts} />
+            </div>
+        </div>
+        <div className="topbar-center">
+            <SearchField value={query} onChange={setQuery} />
+        </div>
+        <div className="topbar-right">
+            <div className="topbar-right-lead">
+                <SortMenu value={sort} onChange={setSort} />
+            </div>
+            <div className="topbar-right-tail">
+                <KebabMenu items={kebabItems} />
+            </div>
+        </div>
     </header>
 );

crates/lanspread-tauri-deno-ts/src/hooks/useGameActions.ts

@@ -1,10 +1,12 @@
 import { useCallback } from 'react';
 import { invoke } from '@tauri-apps/api/core';
 
-import { UseGamesResult } from './useGames';
+import { type UseGamesResult } from './useGames';
+import { type UISettings } from './useSettings';
 
 export interface GameActions {
     play: (id: string) => Promise<void>;
+    startServer: (id: string) => Promise<void>;
     install: (id: string) => Promise<void>;
     update: (id: string) => Promise<void>;
     uninstall: (id: string) => Promise<void>;
@@ -19,18 +21,40 @@ export interface GameActions {
  * are marked as "checking peers" until the backend emits an authoritative
  * operation snapshot; cancellation waits for the backend to clear that snapshot.
  */
-export const useGameActions = (games: UseGamesResult): GameActions => {
+export const useGameActions = (
+    games: UseGamesResult,
+    settings: Pick<UISettings, 'language' | 'username'>,
+): GameActions => {
     const play = useCallback(async (id: string) => {
         try {
-            await invoke('run_game', { id });
+            await invoke('run_game', {
+                id,
+                language: settings.language,
+                username: settings.username,
+            });
         } catch (err) {
             console.error('run_game failed:', err);
         }
-    }, []);
+    }, [settings.language, settings.username]);
+
+    const startServer = useCallback(async (id: string) => {
+        try {
+            await invoke('start_server', {
+                id,
+                language: settings.language,
+                username: settings.username,
+            });
+        } catch (err) {
+            console.error('start_server failed:', err);
+        }
+    }, [settings.language, settings.username]);
 
     const install = useCallback(async (id: string) => {
         try {
-            const success = await invoke<boolean>('install_game', { id });
+            const success = await invoke<boolean>('install_game', {
+                id,
+                username: settings.username,
+            });
             if (!success) return;
 
             const game = games.games.find(item => item.id === id);
@@ -40,16 +64,19 @@ export const useGameActions = (games: UseGamesResult): GameActions => {
         } catch (err) {
             console.error('install_game failed:', err);
         }
-    }, [games]);
+    }, [games, settings.username]);
 
     const update = useCallback(async (id: string) => {
         try {
-            const success = await invoke<boolean>('update_game', { id });
+            const success = await invoke<boolean>('update_game', {
+                id,
+                username: settings.username,
+            });
             if (success) games.markChecking(id);
         } catch (err) {
             console.error('update_game failed:', err);
         }
-    }, [games]);
+    }, [games, settings.username]);
 
     const uninstall = useCallback(async (id: string) => {
         try {
@@ -83,5 +110,5 @@ export const useGameActions = (games: UseGamesResult): GameActions => {
         }
     }, []);
 
-    return { play, install, update, uninstall, removeDownload, cancelDownload, viewFiles };
+    return { play, startServer, install, update, uninstall, removeDownload, cancelDownload, viewFiles };
 };

crates/lanspread-tauri-deno-ts/src/hooks/useGameDirectory.ts

@@ -11,6 +11,7 @@ import { GAME_DIR_KEY, SETTINGS_FILE, SETTINGS_FILE_OPTIONS } from '../lib/store
  */
 export const useGameDirectory = () => {
     const [gameDir, setGameDir] = useState('');
+    const [gameDirExists, setGameDirExists] = useState(false);
 
     useEffect(() => {
         let cancelled = false;
@@ -30,7 +31,11 @@ export const useGameDirectory = () => {
     }, []);
 
     useEffect(() => {
-        if (!gameDir) return;
+        if (!gameDir.trim()) {
+            setGameDirExists(false);
+            return;
+        }
+        let cancelled = false;
         const sync = async () => {
             try {
                 const store = await load(SETTINGS_FILE, SETTINGS_FILE_OPTIONS);
@@ -38,19 +43,50 @@ export const useGameDirectory = () => {
             } catch (err) {
                 console.error('Failed to persist game directory:', err);
             }
+
+            let exists = false;
+            try {
+                exists = await invoke<boolean>('game_directory_exists', { path: gameDir });
+            } catch (err) {
+                console.error('Failed to validate game directory:', err);
+            }
+            if (cancelled) return;
+            setGameDirExists(exists);
+            if (!exists) return;
+
+            invoke('update_game_directory', { path: gameDir }).catch(err =>
+                console.error('Failed to push game directory to backend:', err),
+            );
         };
         void sync();
-        invoke('update_game_directory', { path: gameDir }).catch(err =>
-            console.error('Failed to push game directory to backend:', err),
-        );
+        return () => {
+            cancelled = true;
+        };
     }, [gameDir]);
 
+    const hasGameDirectory = gameDir.trim() !== '' && gameDirExists;
+
     const rescan = useCallback(() => {
-        if (!gameDir) return;
-        invoke('update_game_directory', { path: gameDir }).catch(err =>
-            console.error('Failed to rescan game directory:', err),
-        );
+        if (!gameDir.trim()) {
+            setGameDirExists(false);
+            return;
+        }
+        const sync = async () => {
+            let exists = false;
+            try {
+                exists = await invoke<boolean>('game_directory_exists', { path: gameDir });
+            } catch (err) {
+                console.error('Failed to validate game directory:', err);
+            }
+            setGameDirExists(exists);
+            if (!exists) return;
+
+            invoke('update_game_directory', { path: gameDir }).catch(err =>
+                console.error('Failed to rescan game directory:', err),
+            );
+        };
+        void sync();
     }, [gameDir]);
 
-    return { gameDir, setGameDir, rescan };
+    return { gameDir, gameDirExists, hasGameDirectory, setGameDir, rescan };
 };

crates/lanspread-tauri-deno-ts/src/hooks/useSettings.ts

@@ -1,7 +1,7 @@
 import { useCallback, useEffect, useState } from 'react';
 import { load } from '@tauri-apps/plugin-store';
 
-import { GameFilter, GameSort } from '../lib/types';
+import { type GameFilter, type GameSort, type LauncherLanguage } from '../lib/types';
 import { SETTINGS_FILE, SETTINGS_FILE_OPTIONS, UI_SETTINGS_KEY } from '../lib/store';
 
 export type Density = 'compact' | 'normal' | 'large';
@@ -15,10 +15,14 @@ export interface UISettings {
     aspect: CoverAspect;
     sort: GameSort;
     filter: GameFilter;
+    username: string;
+    language: LauncherLanguage;
 }
 
 type StoredGameSort = GameSort | 'size';
 type StoredUISettings = Partial<Omit<UISettings, 'sort'> & { sort: StoredGameSort }>;
+const DEFAULT_USERNAME = 'Commander';
+const MAX_USERNAME_LENGTH = 24;
 
 export const ACCENT_OPTIONS = [
     { value: '#3b82f6', label: 'Blue' },
@@ -47,6 +51,18 @@ export const ASPECT_OPTIONS: ReadonlyArray<{ value: CoverAspect; label: string }
     { value: 'banner', label: 'Banner' },
 ];
 
+export const LANGUAGE_OPTIONS: ReadonlyArray<{ value: LauncherLanguage; label: string }> = [
+    { value: 'en', label: 'English' },
+    { value: 'de', label: 'Deutsch' },
+];
+
+const defaultLanguage = (): LauncherLanguage => {
+    if (typeof navigator !== 'undefined' && navigator.language.toLowerCase().startsWith('de')) {
+        return 'de';
+    }
+    return 'en';
+};
+
 export const DEFAULT_SETTINGS: UISettings = {
     accent: '#3b82f6',
     bg: 'gradient',
@@ -54,6 +70,8 @@ export const DEFAULT_SETTINGS: UISettings = {
     aspect: 'square',
     sort: 'status',
     filter: 'local',
+    username: DEFAULT_USERNAME,
+    language: defaultLanguage(),
 };
 
 const sanitize = (raw: StoredUISettings | undefined): UISettings => ({
@@ -63,12 +81,23 @@ const sanitize = (raw: StoredUISettings | undefined): UISettings => ({
     aspect: raw?.aspect ?? DEFAULT_SETTINGS.aspect,
     sort: sanitizeSort(raw?.sort),
     filter: raw?.filter ?? DEFAULT_SETTINGS.filter,
+    username: sanitizeUsername(raw?.username),
+    language: sanitizeLanguage(raw?.language),
 });
 
 const sanitizeSort = (sort: StoredGameSort | undefined): GameSort => (
     sort === 'size' ? 'sizeDesc' : sort ?? DEFAULT_SETTINGS.sort
 );
 
+const sanitizeLanguage = (language: LauncherLanguage | undefined): LauncherLanguage => (
+    language === 'de' || language === 'en' ? language : DEFAULT_SETTINGS.language
+);
+
+const sanitizeUsername = (username: string | undefined): string => {
+    const trimmed = username?.trim() ?? '';
+    return trimmed ? Array.from(trimmed).slice(0, MAX_USERNAME_LENGTH).join('') : DEFAULT_USERNAME;
+};
+
 export interface UseSettings {
     settings: UISettings;
     set: <K extends keyof UISettings>(key: K, value: UISettings[K]) => void;

crates/lanspread-tauri-deno-ts/src/lib/format.ts

@@ -19,10 +19,6 @@ export const formatEtiVersion = (raw: string | undefined): string => {
     return raw;
 };
 
-/** Truncate a path with a leading ellipsis when it exceeds the limit. */
-export const truncatePath = (path: string, max = 36): string =>
-    path.length > max ? `…${path.slice(-(max - 1))}` : path;
-
 export const formatPlayers = (max?: number): string => {
     if (!max || max <= 0) return '—';
     return max === 1 ? '1' : `1–${max}`;

crates/lanspread-tauri-deno-ts/src/lib/types.ts

@@ -58,6 +58,7 @@ export interface Game {
     status_level?: StatusLevel;
     download_progress?: DownloadProgress;
     peer_count: number;
+    can_host_server?: boolean;
 }
 
 export interface ActiveOperation {
@@ -78,3 +79,6 @@ export type GameSort = 'az' | 'sizeDesc' | 'sizeAsc' | 'status';
 
 /** Visual state of a card. Derived from backend operation status and local flags. */
 export type DerivedState = 'installed' | 'local' | 'downloading' | 'none' | 'busy';
+
+/** Two-character language code passed through to game scripts. */
+export type LauncherLanguage = 'en' | 'de';

crates/lanspread-tauri-deno-ts/src/styles/launcher.css

@@ -6,6 +6,8 @@
   flex-direction: column;
   background: var(--bg-0);
   color: var(--t-1);
+  container-type: inline-size;
+  container-name: launcher;
   overflow: hidden;
   position: relative;
   isolation: isolate;
@@ -56,7 +58,7 @@
   }
 }
 
-/* Top bar */
+/* Top bar — three visual zones with search at the geometric center */
 .topbar {
   position: relative;
   z-index: 10;
@@ -64,12 +66,75 @@
   -webkit-backdrop-filter: blur(20px) saturate(140%);
   backdrop-filter: blur(20px) saturate(140%);
   border-bottom: 1px solid var(--bd-1);
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
+  align-items: center;
+  column-gap: 16px;
+  padding: 14px 24px;
+  min-height: 64px;
+}
+.topbar-left {
   display: flex;
   align-items: center;
-  gap: 18px;
-  padding: 14px 24px;
-  flex-wrap: nowrap;
-  min-height: 64px;
+  justify-content: space-between;
+  gap: 16px;
+  min-width: 0;
+}
+.topbar-left-trail {
+  display: flex;
+  align-items: center;
+  min-width: 0;
+}
+.topbar-center {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-width: 0;
+}
+.topbar-center .search {
+  flex: 0 1 360px;
+  min-width: 0;
+}
+.topbar-right {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  min-width: 0;
+}
+.topbar-right-lead {
+  display: flex;
+  align-items: center;
+  min-width: 0;
+}
+.topbar-right-tail {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  min-width: 0;
+}
+
+/* Below ~1100px of launcher width the geometric centering stops reading —
+   collapse the three zones into a single left-to-right flowing row. */
+@container launcher (max-width: 1100px) {
+  .topbar {
+    display: flex;
+    flex-wrap: nowrap;
+    gap: 16px;
+  }
+  .topbar-left,
+  .topbar-center,
+  .topbar-right {
+    justify-content: flex-start;
+    flex: 0 0 auto;
+    gap: 12px;
+  }
+  .topbar-center {
+    flex: 1 1 200px;
+  }
+  .topbar-center .search {
+    flex: 1 1 auto;
+  }
 }
 
 /* Brand */
@@ -239,6 +304,10 @@
   color: var(--t-1);
   background: rgba(255, 255, 255, 0.08);
 }
+.search-clear.is-hidden {
+  visibility: hidden;
+  pointer-events: none;
+}
 .search-kbd {
   display: inline-grid;
   place-items: center;
@@ -325,46 +394,6 @@
   color: var(--accent);
 }
 
-/* Directory button */
-.dirbtn {
-  display: inline-flex;
-  align-items: center;
-  gap: 8px;
-  height: 36px;
-  padding: 0 12px;
-  background: var(--bg-2);
-  border: 1px solid var(--bd-1);
-  border-radius: 8px;
-  color: var(--t-2);
-  font: inherit;
-  font-size: 12.5px;
-  cursor: pointer;
-  max-width: 360px;
-  transition:
-    border-color 0.15s,
-    color 0.15s;
-  flex-shrink: 1;
-  min-width: 0;
-}
-.dirbtn:hover {
-  border-color: var(--bd-2);
-  color: var(--t-1);
-}
-.dirbtn-label {
-  color: var(--t-1);
-  font-weight: 600;
-  flex-shrink: 0;
-}
-.dirbtn-path {
-  color: var(--t-3);
-  font-family: var(--font-mono);
-  font-size: 11.5px;
-  white-space: nowrap;
-  overflow: hidden;
-  text-overflow: ellipsis;
-  min-width: 0;
-}
-
 /* Kebab menu */
 .kebab {
   position: relative;
@@ -807,6 +836,20 @@
   background: rgba(255, 255, 255, 0.12);
   border-color: var(--bd-3);
 }
+.act-server {
+  color: var(--t-1);
+  background: color-mix(in srgb, var(--accent) 14%, rgba(255, 255, 255, 0.04));
+  border: 1px solid color-mix(in srgb, var(--accent) 55%, transparent);
+  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
+}
+.act-server:hover:not(:disabled) {
+  background: color-mix(in srgb, var(--accent) 22%, rgba(255, 255, 255, 0.04));
+  border-color: color-mix(in srgb, var(--accent) 75%, transparent);
+  filter: none;
+}
+.act-server svg {
+  color: var(--accent);
+}
 .act-busy {
   color: var(--t-1);
   background: rgba(255, 255, 255, 0.06);
@@ -1454,11 +1497,18 @@
 }
 .settings-foot {
   display: flex;
-  justify-content: flex-end;
+  align-items: center;
+  justify-content: space-between;
   padding: 14px 22px 18px;
   border-top: 1px solid var(--bd-1);
   gap: 10px;
 }
+.settings-build-nr {
+  min-width: 0;
+  color: var(--t-3);
+  font-size: 12px;
+  font-variant-numeric: tabular-nums;
+}
 .settings-done {
   height: 36px;
   padding: 0 22px;
@@ -1475,6 +1525,123 @@
   filter: brightness(1.1);
 }
 
+/* Settings: text input */
+.settings-text {
+  display: inline-flex;
+  align-items: center;
+  width: 220px;
+  height: 36px;
+  padding: 0 12px;
+  background: var(--bg-3);
+  border: 1px solid var(--bd-1);
+  border-radius: 8px;
+  transition:
+    background 0.15s,
+    border-color 0.15s,
+    box-shadow 0.15s;
+}
+.settings-text:focus-within {
+  background: var(--bg-2);
+  border-color: var(--accent);
+  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent);
+}
+.settings-text input {
+  min-width: 0;
+  flex: 1;
+  background: transparent;
+  border: 0;
+  outline: 0;
+  color: var(--t-1);
+  font: inherit;
+  font-size: 13.5px;
+  font-weight: 600;
+  letter-spacing: 0;
+}
+.settings-text input::placeholder {
+  color: var(--t-3);
+  font-weight: 500;
+}
+
+/* Settings: game-folder field */
+.folder-field {
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  width: 340px;
+  height: 36px;
+  padding: 0 4px 0 12px;
+  background: var(--bg-3);
+  border: 1px solid var(--bd-1);
+  border-radius: 8px;
+  transition:
+    border-color 0.15s,
+    background 0.15s;
+}
+.folder-field:hover {
+  border-color: var(--bd-2);
+}
+.folder-field.is-unset {
+  border-color: color-mix(in srgb, var(--danger) 35%, var(--bd-1));
+  background: color-mix(in srgb, var(--danger) 6%, var(--bg-3));
+}
+.folder-field.is-unset:hover {
+  border-color: color-mix(in srgb, var(--danger) 55%, var(--bd-2));
+}
+.folder-field-icon {
+  color: var(--t-3);
+  flex-shrink: 0;
+}
+.folder-field.is-unset .folder-field-icon {
+  color: #f87171;
+}
+.folder-field-path {
+  flex: 1;
+  min-width: 0;
+  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
+  font-size: 12px;
+  color: var(--t-1);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  direction: rtl;
+  text-align: left;
+  unicode-bidi: plaintext;
+}
+.folder-field-empty {
+  font-family: var(--font-ui);
+  font-size: 12.5px;
+  font-weight: 600;
+  color: #f87171;
+  letter-spacing: 0;
+}
+.folder-field-btn {
+  flex-shrink: 0;
+  height: 28px;
+  padding: 0 12px;
+  border: 0;
+  border-radius: 6px;
+  background: rgba(255, 255, 255, 0.06);
+  color: var(--t-1);
+  font: inherit;
+  font-size: 12.5px;
+  font-weight: 600;
+  letter-spacing: 0;
+  cursor: pointer;
+  transition:
+    background 0.15s,
+    color 0.15s;
+}
+.folder-field-btn:hover {
+  background: rgba(255, 255, 255, 0.12);
+}
+.folder-field.is-unset .folder-field-btn {
+  background: color-mix(in srgb, var(--accent) 85%, transparent);
+  color: #fff;
+}
+.folder-field.is-unset .folder-field-btn:hover {
+  background: var(--accent);
+}
+
 /* Settings: color swatches */
 .swatch-row {
   display: inline-flex;
@@ -1588,6 +1755,9 @@
   margin: 0 0 20px;
   max-width: 44ch;
 }
+.empty-state-title + .ghost-btn {
+  margin-top: 14px;
+}
 .empty-state .ghost-btn {
   background: var(--accent);
   color: white;

crates/lanspread-tauri-deno-ts/src/vite-env.d.ts

@@ -1 +1,5 @@
 /// <reference types="vite/client" />
+
+interface ImportMetaEnv {
+    readonly VITE_LANSPREAD_BUILD_NR: string;
+}

crates/lanspread-tauri-deno-ts/src/windows/MainWindow.tsx

@@ -45,22 +45,25 @@ const openLogsWindow = async () => {
 
 export const MainWindow = () => {
     const { settings, set: setSetting } = useSettings();
-    const { gameDir, setGameDir, rescan } = useGameDirectory();
+    const { gameDir, hasGameDirectory, setGameDir, rescan } = useGameDirectory();
     const games = useGames(rescan);
-    const actions = useGameActions(games);
+    const actions = useGameActions(games, settings);
     const thumbnails = useThumbnails();
 
     const [openGameId, setOpenGameId] = useState<string | null>(null);
     const [removeGameId, setRemoveGameId] = useState<string | null>(null);
     const [settingsOpen, setSettingsOpen] = useState(false);
-
-    const counts = useMemo(() => countByFilter(games.games), [games.games]);
+    const visibleGames = useMemo(
+        () => hasGameDirectory ? games.games : [],
+        [games.games, hasGameDirectory],
+    );
+    const counts = useMemo(() => countByFilter(visibleGames), [visibleGames]);
 
     // Query is local UI state (no need to persist).
     const [query, setQuery] = useState('');
     const filteredGames = useMemo(
-        () => applyFilterAndSort(games.games, settings.filter, settings.sort, query),
-        [games.games, settings.filter, settings.sort, query],
+        () => applyFilterAndSort(visibleGames, settings.filter, settings.sort, query),
+        [visibleGames, settings.filter, settings.sort, query],
     );
 
     const openGame = useMemo<Game | null>(
@@ -116,25 +119,23 @@ export const MainWindow = () => {
 
     return (
         <div className={className} style={rootStyle}>
-            {gameDir ? (
-                <>
-                    <TopBar
-                        peerCount={games.totalPeerCount}
-                        filter={settings.filter}
-                        setFilter={(v) => setSetting('filter', v)}
-                        counts={counts}
-                        query={query}
-                        setQuery={setQuery}
-                        sort={settings.sort}
-                        setSort={(v) => setSetting('sort', v)}
-                        gameDir={gameDir}
-                        onPickDirectory={() => void pickDirectory()}
-                        kebabItems={kebabItems}
-                    />
-                    <main className="grid-wrap">
+            <TopBar
+                peerCount={games.totalPeerCount}
+                filter={settings.filter}
+                setFilter={(v) => setSetting('filter', v)}
+                counts={counts}
+                query={query}
+                setQuery={setQuery}
+                sort={settings.sort}
+                setSort={(v) => setSetting('sort', v)}
+                kebabItems={kebabItems}
+            />
+            <main className="grid-wrap">
+                {hasGameDirectory ? (
+                    <>
                         <ResultsBar shown={filteredGames.length} total={counts.all} />
                         {filteredGames.length === 0 ? (
-                            games.games.length === 0 ? (
+                            visibleGames.length === 0 ? (
                                 <EmptyResultsState
                                     title="Scanning for games"
                                     hint="Looking for game bundles in your selected directory…"
@@ -155,13 +156,11 @@ export const MainWindow = () => {
                                 onCancelDownload={(g) => actions.cancelDownload(g.id)}
                             />
                         )}
-                    </main>
-                </>
-            ) : (
-                <main className="grid-wrap">
+                    </>
+                ) : (
                     <NoDirectoryState onChooseDirectory={() => void pickDirectory()} />
-                </main>
-            )}
+                )}
+            </main>
 
             {openGame && (
                 <GameDetailModal
@@ -172,6 +171,7 @@ export const MainWindow = () => {
                     onUninstall={handleUninstall}
                     onRemoveDownload={handleRemoveDownload}
                     onCancelDownload={(g) => actions.cancelDownload(g.id)}
+                    onStartServer={(g) => actions.startServer(g.id)}
                     onViewFiles={(g) => actions.viewFiles(g.id)}
                 />
             )}
@@ -187,6 +187,9 @@ export const MainWindow = () => {
             {settingsOpen && (
                 <SettingsDialog
                     settings={settings}
+                    gameDir={gameDir}
+                    hasGameDirectory={hasGameDirectory}
+                    onPickDirectory={() => void pickDirectory()}
                     onChange={setSetting}
                     onClose={() => setSettingsOpen(false)}
                 />

crates/lanspread-tauri-deno-ts/vite.config.ts

@@ -1,12 +1,18 @@
 import { defineConfig } from "vite";
 import react from "@vitejs/plugin-react";
 
+// A timestamp keeps build numbers monotonic without a checked-in counter file.
+const buildNr = Date.now().toString();
+
 // @ts-expect-error process is a nodejs global
 const host = process.env.TAURI_DEV_HOST;
 
 // https://vitejs.dev/config/
 export default defineConfig(async () => ({
   plugins: [react()],
+  define: {
+    "import.meta.env.VITE_LANSPREAD_BUILD_NR": JSON.stringify(buildNr),
+  },
 
   // Vite options tailored for Tauri development and only applied in `tauri dev` or `tauri build`
   //

design/README.md

@@ -32,6 +32,29 @@ The HTML mock includes two chrome variants — **A (single-row)** and **B (two-r
 
 ---
 
+## Changes since v3
+
+- **Game-folder button removed from the top bar.** Setting the games directory is a one-time action — it doesn't deserve permanent real estate in the chrome. The button is gone from both top-bar variants, freeing the right zone for the kebab menu alone (variant A) / the storage meter + kebab pair (variant B).
+- **Game folder moved into Settings → Library.** Now a row inside the Settings dialog, styled like the other Library rows. Two visual states (set / not-set) carry over from the old button — see "Settings dialog → Library → Game folder" below.
+- **Persisted setting renamed.** `gameFolderSet: boolean` → `gameFolder: string | null`. The actual path is now persisted, not just a "is it configured?" flag. Default is `null` (unset on first run; user must pick a folder before the library scans).
+
+## Changes since v2
+
+- **Top bar layout reorganized.** The single-row top bar is now structured as three visual zones (still one row on wide windows):
+  - **Left:** brand mark + wordmark.
+  - **Center (semantically the "search cluster"):** segmented filter pills · search field · sort menu. The **search field is positioned at the geometric center of the window** — filter pills sit immediately to its left, sort menu immediately to its right.
+  - **Right:** kebab menu (game-folder configuration has moved into Settings — see v3 changes).
+  - Below ~1100 px of launcher width (container query), the three zones collapse into a single left-to-right flowing row (no wrap, no centering). Implement via container query on the launcher root; viewport media query is acceptable if your codebase doesn't use container queries yet.
+  - See "Top bar (variant A)" below for the full spec and rationale.
+
+## Changes since v1
+
+- **Settings → Profile section** added at the top of the dialog with two new persisted preferences: **Username** (text input) and **Language** (segmented `English` / `Deutsch`). See "Settings dialog" below for shape + persistence keys.
+- **Start Server** action added to the **game detail overlay**, next to **Play**, for installed games that support a dedicated server. Driven by a new `canHostServer: true` flag on the game record. See "Detail overlay → Actions row" and "Game data shape" for the full spec.
+- Grid cards are **unchanged** — Start Server only ever appears in the detail overlay.
+
+---
+
 ## Screens / views
 
 ### 1. Main library (variant A — primary)
@@ -40,21 +63,29 @@ The default screen. A grid of game cards over a dark, gradient-tinted background
 
 **Layout (top-to-bottom):**
 
-1. **Top bar** — single row, sticky, full width, 64px tall, semi-transparent dark with backdrop-blur. Background `rgba(10,14,19,0.65)` + `backdrop-filter: blur(20px) saturate(140%)`. Border-bottom `1px solid rgba(255,255,255,0.06)`. Contents, left-to-right with 18px gap and 24px horizontal padding:
+1. **Top bar** — single row, sticky, full width, 64px tall, semi-transparent dark with backdrop-blur. Background `rgba(10,14,19,0.65)` + `backdrop-filter: blur(20px) saturate(140%)`. Border-bottom `1px solid rgba(255,255,255,0.06)`. Padding `14px 24px`. **Layout:** a 3-column CSS grid — `grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr)` with `column-gap: 16px` — putting the search field in the middle (auto-sized) column so it sits at the **geometric center of the window** regardless of how wide the side groups are. The side columns are each `display: flex; justify-content: space-between` so their contents pin to the outer edge on one end and hug the search on the other.
 
-   - **Brand** — 28×28px rounded square in `--accent` (default `#3b82f6`) with the letter "S" in Bebas Neue 20px white. Next to it, the wordmark "SoftLAN" in 15px / 700 weight `--t-1` `#e6edf3`.
-   - **Segmented filter pills** — pill-shaped container (`background var(--bg-2) #131b25`, `1px solid rgba(255,255,255,0.06)`, `border-radius: 999px`, `padding: 4px`). Three buttons:
-     - `All Games` · count chip
-     - `Local` · count chip
-     - `Installed` · count chip
-     
-     Active button has an animated pill thumb (background `var(--accent)`, transitions `left` and `width` with `cubic-bezier(.4,1.2,.5,1)` over 220ms), text becomes white, count-chip background goes `rgba(0,0,0,0.25)`. Inactive: text `var(--t-2) #9aa6b4`, count-chip background `rgba(255,255,255,0.08)`.
-     
-     `Local` = installed *or* downloaded-but-not-yet-installed. `Installed` = installed only. `All Games` = everything available on the network.
-   - **Search field** — 36px tall, min-width 320px (flex 0 1 380px). `background var(--bg-2)`, `1px solid var(--bd-1)`, `border-radius: 8px`, padding `0 12px`. Has a leading magnifying-glass icon (14×14, `currentColor`) and a trailing "/" kbd hint (`background rgba(255,255,255,0.06)`, `border-radius: 4px`, font `11px ui-monospace`). On focus: border becomes `color-mix(in srgb, var(--accent) 60%, var(--bd-2))`, background `var(--bg-1)`, ring `box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 16%, transparent)`. The "/" key shortcut should focus the search.
-   - **Sort menu** — 36px button, same surface style as search. Label `Sort: <bold value>` plus 13px sort-bars icon and 11px chevron. Click reveals dropdown menu below. Options: `Name (A–Z)`, `Size (largest)`, `Recently Played`, `Status`.
-   - **Game directory button** — 36px button, max-width 360px. Folder icon, "Game directory" label (600 weight `--t-1`), then the current path in `ui-monospace` 11.5px `--t-3` truncated with leading ellipsis when long (e.g. `…s/Desktop/eti_games_AFTER_LAN_2025`).
-   - **Kebab menu** (`⋮`) — 36×36 button with same surface. Menu items: `Settings` (opens Settings dialog — see below), `Refresh library`, separator, `Unpack logs`, `About SoftLAN`.
+   - **Left zone (col 1, flex space-between):**
+     - **Brand** (pinned far-left) — 28×28 px rounded square in `--accent` (default `#3b82f6`) with the letter "S" in Bebas Neue 20 px white. Next to it, the wordmark "SoftLAN" in 15 px / 700 weight `--t-1` `#e6edf3`.
+     - **Segmented filter pills** (pinned right, hugging the search field) — pill-shaped container (`background var(--bg-2) #131b25`, `1px solid rgba(255,255,255,0.06)`, `border-radius: 999px`, `padding: 4px`). Three buttons:
+       - `All Games` · count chip
+       - `Local` · count chip
+       - `Installed` · count chip
+
+       Active button has an animated pill thumb (background `var(--accent)`, transitions `left` and `width` with `cubic-bezier(.4,1.2,.5,1)` over 220 ms), text becomes white, count-chip background goes `rgba(0,0,0,0.25)`. Inactive: text `var(--t-2) #9aa6b4`, count-chip background `rgba(255,255,255,0.08)`.
+
+       `Local` = installed *or* downloaded-but-not-yet-installed. `Installed` = installed only. `All Games` = everything available on the network.
+
+       The filter is grouped semantically with the search — it scopes what the user is searching, so it belongs at the search field's left shoulder.
+
+   - **Center zone (col 2, search alone):**
+     - **Search field** — 36 px tall, `flex: 0 1 360px` (caps at 360 px wide so it can't elbow into the side zones). `background var(--bg-2)`, `1px solid var(--bd-1)`, `border-radius: 8px`, padding `0 12px`. Leading magnifying-glass icon (14×14, `currentColor`) and a trailing "/" kbd hint (`background rgba(255,255,255,0.06)`, `border-radius: 4px`, font `11px ui-monospace`). On focus: border `color-mix(in srgb, var(--accent) 60%, var(--bd-2))`, background `var(--bg-1)`, ring `box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 16%, transparent)`. The `/` key shortcut should focus the search.
+
+   - **Right zone (col 3, flex space-between with two sub-groups):**
+     - **Sort menu** (pinned left, hugging search) — 36 px button, same surface style as search. Label `Sort: <bold value>` plus 13 px sort-bars icon and 11 px chevron. Click reveals dropdown menu below. Options: `Name (A–Z)`, `Size (largest)`, `Recently Played`, `Status`. This is the only thing on the *left* side of the right zone — it's part of the search cluster, so it hugs the search.
+     - **Kebab menu** (`⋮`, pinned far-right) — 36×36 button with same surface as search. Menu items: `Settings` (opens Settings dialog), `Refresh library`, separator, `Unpack logs`, `About SoftLAN`. This is the only "app-level" control left in the top bar; the game-folder picker has moved into Settings.
+
+   **Narrow-window fallback** (container width < 1100 px): the grid is replaced by a single `display: flex; flex-wrap: nowrap; gap: 16px` row. All items align left-to-right in source order (brand → filter → search → sort → kebab). The search field becomes `flex: 1 1 auto` so it absorbs remaining slack. The geometric centering is abandoned at narrow widths because there isn't enough horizontal slack for it to read cleanly. Implement via container query (`@container launcher (max-width: 1100px)`) on the launcher root; a viewport media query is an acceptable fallback if you're not using container queries yet.
 
 2. **Results bar** — 18px top padding inside the scroll wrapper, 24px horizontal. Flex row with space-between:
    - Left: `Showing <strong>N</strong> of M games` in 12.5px `var(--t-2)` (strong is `var(--t-1)`).
@@ -88,12 +119,26 @@ Opens when the user **clicks anywhere on a game card except the action button**.
 2. **Body** — 22px top, 26px bottom, 28px horizontal:
    - **Meta grid** — 4-column CSS grid, 12px gap. Each cell: `padding 10px 12px`, `background rgba(255,255,255,0.025)`, `1px solid var(--bd-1)`, `border-radius: 8px`. Cells (in order): `Size` (e.g. 8.2 GB), `Players` (icon + range), `Version` (mono, e.g. 2018.04.12), `Status` (Installed / Local / Not downloaded).
    - **Description** — 14px / 1.55 line-height, `var(--t-2)`, `text-wrap: pretty`, `max-width: 64ch`.
-   - **Actions row** — flex row, 10px gap, 4px top padding:
-     - Primary action button (44px tall, see "Action button" below — Play / Install / Download depending on state)
-     - If `state === 'installed'`: ghost-button **Uninstall** — 44px, `background rgba(255,255,255,0.04)`, `1px solid var(--bd-2)`, `border-radius: 8px`, text `#f87171`, trash icon. On hover: bg `rgba(239,68,68,0.10)`, border `rgba(239,68,68,0.40)`, text `#fca5a5`.
-     - If `state === 'local'`: ghost-button **Delete from disk** (same danger styling).
-     - Spacer (`flex: 1`).
-     - Ghost-button **View files** (neutral) — opens system file manager at the game folder.
+   - **Actions row** — flex row, 10px gap, 4px top padding. Order, left → right:
+     1. **Primary action button** (44px tall, see "Action button" below — Play / Install / Download depending on state).
+     2. **Start Server** — *only* when `game.canHostServer === true` **and** `state === 'installed'`. Same 44px height as Play, but visually a peer secondary action (see "Start Server button" below). Triggers a Tauri command that spawns the game's dedicated-server executable in headless mode against the local LAN (port + server config out of scope here — leave a `startServer(gameId)` IPC stub).
+     3. If `state === 'installed'`: ghost-button **Uninstall** — 44px, `background rgba(255,255,255,0.04)`, `1px solid var(--bd-2)`, `border-radius: 8px`, text `#f87171`, trash icon. On hover: bg `rgba(239,68,68,0.10)`, border `rgba(239,68,68,0.40)`, text `#fca5a5`.
+     4. If `state === 'local'`: ghost-button **Delete from disk** (same danger styling).
+     5. If `state === 'downloading'`: ghost-button **Cancel** (same danger styling).
+     6. Spacer (`flex: 1`).
+     7. Ghost-button **View files** (neutral) — opens system file manager at the game folder.
+
+#### Start Server button
+
+A secondary-but-equal action that sits next to **Play**. The intent is to read as a host-action ("I want to put this game on the LAN") without competing with the green Play button for the player's primary attention.
+
+- Same shape and height as Play: 44px tall, `border-radius: 8px`, `font 14px / 600`, 8px gap between icon and label, padding `0 22px`.
+- Surface: `background: color-mix(in srgb, var(--accent) 14%, rgba(255,255,255,0.04))`, `border: 1px solid color-mix(in srgb, var(--accent) 55%, transparent)`, `box-shadow: inset 0 1px 0 rgba(255,255,255,0.06)`. Text in `--t-1`.
+- **Icon** in `--accent`: a small server-rack glyph (two stacked rounded rectangles each with an LED dot and a hint of wiring). 13×13. SVG in `components.jsx → Icon.server`.
+- Hover: `background: color-mix(in srgb, var(--accent) 22%, ...)`, border darkens to `color-mix(... 75%, transparent)`. Active: `transform: scale(0.98)` (shared with `.act-btn`).
+- A future *running* state (live indicator dot + "Server running" label + click-to-stop) is **not** in this round — flag as a follow-up when wiring the real spawn.
+
+The button is purposefully **not** present on game cards in the grid — hosting a server is intentional and benefits from the context of the detail overlay (player count, version, etc.). Don't add it to cards.
 
 ---
 
@@ -108,10 +153,20 @@ Opens when the user clicks **Settings** from the kebab menu. Same modal-scrim tr
 │ Settings                            [×] │  ← head: 22 28 18, 1px bottom border
 ├─────────────────────────────────────────┤
 │                                         │
-│ APPEARANCE                              │  ← section title: 10.5px / 700 / 0.12em / uppercase / --t-3
+│ PROFILE                                 │  ← section title (new): 10.5px / 700 / 0.12em / uppercase / --t-3
 │                                         │
-│ Accent color                            │  ← row label: 14px / 600 / --t-1
-│ Used for primary actions and highlights │  ← row hint: 12px / --t-3
+│ Username                                │  ← row label: 14px / 600 / --t-1
+│ Shown to other players on the LAN       │  ← row hint: 12px / --t-3
+│                  [ Enter a username   ] │  ← text input (220×36)
+│                                         │
+│ Language                                │
+│ Interface language                      │
+│                       [English│Deutsch] │  ← segmented radio (new)
+│                                         │
+│ APPEARANCE                              │
+│                                         │
+│ Accent color                            │
+│ Used for primary actions and highlights │
 │                       ⬤⬤⬤⬤⬤⬤            │  ← 6 swatches, right-aligned
 │                                         │
 │ Background                              │
@@ -120,6 +175,11 @@ Opens when the user clicks **Settings** from the kebab menu. Same modal-scrim tr
 │                                         │
 │ LIBRARY                                 │
 │                                         │
+│ Game folder                             │
+│ Parent directory where games are        │
+│ downloaded and installed                │
+│   [📁 /home/pfs/…/eti_games  [Change…]] │  ← folder field (340×36)
+│                                         │
 │ Grid density                            │
 │ How tightly cards are packed            │
 │                   [Compact│Normal│Large]│
@@ -138,6 +198,15 @@ Opens when the user clicks **Settings** from the kebab menu. Same modal-scrim tr
 - Left (`settings-row-info`): label (14px / 600 / `--t-1`) + hint (3px-top, 12px / `--t-3`)
 - Right (`settings-row-control`): the control
 
+**Profile section** (new in this round). Two rows, rendered **above** Appearance — it's the most personal/identity-shaped setting so it's the first thing the user sees in Settings.
+
+- **Username** — `<input type="text">` wrapped in a styled container: 220px wide, 36px tall, `background var(--bg-3)`, `1px solid var(--bd-1)`, `border-radius: 8px`, `padding: 0 12px`. Input itself is transparent/borderless, `font 13.5px / 600`, color `--t-1`, placeholder `"Enter a username"` in `--t-3` / 500. `maxLength={24}`, `spellCheck={false}`. On focus the container gets `background var(--bg-2)`, border `var(--accent)`, and an accent focus ring `box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent)`.
+- **Language** — same segmented-radio control as Background / Density / Cover aspect, with two options: `English` (value `'en'`) and `Deutsch` (value `'de'`). Active option gets the accent fill, same as the other segmented radios.
+
+**Library section.** Three rows: **Game folder** (new in v3 — moved out of the top bar), **Grid density**, **Cover aspect**.
+
+- **Game folder** — see "Game-folder field" below. The first row in the section because it's the only setting users *must* configure for the launcher to work; density and aspect are pure preference.
+
 **Color swatch picker:** flex row of 8px-gapped buttons. Each swatch is 32×32, `border-radius: 9px`, no border. Inside, a 100% × 100% rounded-8 colored dot with inset shadow `0 0 0 1px rgba(255,255,255,0.08)`. Hover: dot scales 1.06. **Active**: dot has ring `box-shadow: 0 0 0 2px var(--bg-2), 0 0 0 4px <swatch-color>` and shows a centered white check icon with drop-shadow `0 1px 2px rgba(0,0,0,0.5)`.
 
 Six accent options: Blue `#3b82f6`, Cyan `#22d3ee`, Violet `#a855f7`, Green `#22c55e`, Amber `#f59e0b`, Red `#ef4444`.
@@ -147,10 +216,46 @@ Six accent options: Blue `#3b82f6`, Cyan `#22d3ee`, Violet `#a855f7`, Green `#22
 **Done button:** filled button in `--accent`, 36px tall, 13.5px / 600. Closes the dialog.
 
 Persisted settings (write through to local storage / Tauri config):
+- `username`: string, max 24 chars. Default `"Commander"` (placeholder — feel free to default to the OS username on first run). Used as the network identity for LAN sessions; the hint copy *"Shown to other players on the LAN"* tells the user what it does.
+- `language`: `'en'` | `'de'`. Default `'en'`. Drives an i18n layer (introduce one if it doesn't exist yet — `react-i18next` or similar). Initial copy is English-only in the mock; German translations need to be added as part of implementation. Recommend detecting the OS locale on first run and defaulting to `'de'` if the system language starts with `de`.
 - `accent`: one of the six hex values above. Default `#3b82f6`.
 - `bg`: `flat` | `gradient` | `animated`. Default `gradient`.
 - `density`: `compact` | `normal` | `large`. Default `normal`.
 - `aspect`: `box` | `square` | `banner`. Default `box`.
+- `gameFolder`: `string | null`. Absolute path to the parent directory where games are downloaded and installed. Default `null` (unset on first run). See "Game-folder field" below.
+
+---
+
+## Game-folder field
+
+A settings row inside the **Library** section of the Settings dialog. Exposes the user's currently-configured game folder (the parent directory under which all per-game subfolders live).
+
+**Why it lives in Settings now:** users set this once at install time and basically never touch it again. A permanent top-bar button burned high-attention chrome on a control nobody used after day one. Settings is where one-time configuration belongs.
+
+Two visual states, driven by whether `settings.gameFolder` resolves to an accessible directory:
+
+| State | Trigger | Path display | Border | Button label |
+|---|---|---|---|---|
+| **Set & valid** | path is configured and exists on disk | full path in mono, truncated head-first | default `--bd-1` | `Change…` (neutral pill) |
+| **Not set / invalid** | path is `null`/empty, or path is set but the directory no longer exists | `Not set` in red | tinted red (`color-mix(in srgb, var(--danger) 35%, var(--bd-1))`) + faint red bg tint | `Choose…` (accent-filled pill) |
+
+"Invalid" is intentionally collapsed into the same visual state as "not set" — the user's job is identical (open the picker and pick a folder), so we don't differentiate. If we later need a distinct "missing" state (e.g. to show the *last known* path so the user can re-attach an external drive), introduce a third state then; for now, keep it simple.
+
+**Anatomy:** `inline-flex`, `width: 340px`, `height: 36px`, `padding: 0 4px 0 12px`, `gap: 8px`. `background: var(--bg-3)`, `border-radius: 8px`. Children, left to right:
+
+1. **Folder icon** — `Icon.folder` from `components.jsx`, 14×14, `var(--t-3)` (set state) or `#f87171` (unset state).
+2. **Path display** — `flex: 1`, mono `12px / ui-monospace`, `--t-1`, single line, `overflow: hidden; text-overflow: ellipsis`. **`direction: rtl` + `unicode-bidi: plaintext`** so truncation happens from the head and the leaf folder (the part the user actually cares about) stays visible. When unset: shows the word `Not set` in 12.5 px / 600 / `#f87171` instead.
+3. **Action button** — 28 px tall pill, `border-radius: 6px`, `padding: 0 12px`, `font 12.5px / 600`. Set state: neutral `rgba(255,255,255,0.06)` bg, label `Change…`. Unset state: `var(--accent)` fill at 85% alpha, white text, label `Choose…` (so the call-to-action reads stronger when the path needs picking). Click → native folder picker via Tauri; on selection, write through to `settings.gameFolder` and rescan library.
+
+**Hover:** border darkens to `--bd-2` (set state) or to `color-mix(in srgb, var(--danger) 55%, var(--bd-2))` (unset state). The inner button has its own hover (background opacity bumps).
+
+**Accessibility:** the path itself is selectable text inside the field; the action button carries `aria-label="Change game folder"` / `"Choose game folder"`. The full path is also exposed via `title` on the path-display element so it's reachable on hover when truncated.
+
+**Why no inline path on the previous top-bar button anymore?** Original design squeezed the full path into a top-bar button as truncated mono. It rarely showed the meaningful part of the path on real-world configurations, ate horizontal space, and competed with the actual primary controls (filter / search / sort) for the top bar's attention budget. In the new home (Settings), the field has all the width it needs to show a useful prefix of the path while still keeping the leaf visible — and it's only on screen when the user is actively reconfiguring.
+
+**Data:** the component takes `value: string | null` and an `onChange(next: string)` callback. `null` (or empty/whitespace string) renders the unset state; any non-empty string renders the set state. The `onChange` callback should fire only on successful picker confirmation (not on cancel). In production, derive `value` from your settings store; if you want to additionally validate existence, do the `fs.metadata` check in the store / a hook and pass `null` when the directory is missing.
+
+**Dev preview:** the prototype's Tweaks panel exposes a `Game folder` **text field** (under the *Library* section) that writes directly to `t.gameFolder`. Type any string to simulate the set state; clear it to simulate the unset state. This is dev-only — in the real app the value comes from the settings store via the picker, **not** from a free-form text input. Don't ship the Tweaks panel.
 
 ---
 
@@ -332,8 +437,8 @@ Implement only if you decide variant A doesn't work after building.
 - **Click filter tab / segmented pill** → change filter.
 - **Click sort button** → opens dropdown; click an option → re-sort grid; clicking outside the menu closes it.
 - **Hover game card** → lift + accent border glow + cover image scale 1.03.
-- **Click "Game directory" button** → open native folder picker via Tauri; on selection, rescan library.
 - **Click "Settings"** in kebab → open Settings dialog. Changes apply live and persist immediately (no Apply button — Done just closes).
+- **Click "Change…" / "Choose…" in the Settings → Library → Game folder row** → open native folder picker via Tauri; on selection, write to `settings.gameFolder` and rescan library. The field indicates whether a valid folder is currently configured (mono path + neutral `Change…`) or not (red `Not set` + accent-filled `Choose…`) — see "Game-folder field" above.
 - **Click "Unpack logs"** in kebab → opens a logs viewer (separate window or modal — out of scope for this design).
 - **Click "Refresh library"** in kebab → re-runs the library scan.
 - **Esc** → closes any open modal (detail overlay, Settings).
@@ -363,12 +468,16 @@ type Game = {
   state: 'installed' | 'local' | 'downloading' | 'none';
   progress?: number;   // 0–1 — present only when state === 'downloading'
   speed?: number;      // MB/s — present only when state === 'downloading'
+  peers?: number;      // LAN peers currently seeding
   players: string;     // e.g. "2–32"
   tags: string[];
   cover: { c1: string; c2: string; accent: string; mood?: string };
+  canHostServer?: boolean; // true if the game ships with a dedicated-server binary
 };
 ```
 
+**Server-capable games** in the mock catalog (`canHostServer: true`): BF1942, BF2, CoD2, CoD4, CoD:UO, CS 1.6, CS:Source, Cube 2/Sauerbraten, Doom 3, L4D2, Minecraft, Quake III, TF2, UT2004. RTS / social-deduction / co-op-only-P2P games (AoE II HD, RA3, Generals ZH, Among Us, Portal 2, StarCraft, Warcraft III, AvP, 8-Bit Armies, BlazeRush) are not flagged — they host in-game. In production the flag should come from the same per-game manifest that drives titles / sizes / cover art. Wire each entry to whatever launch command the dedicated server uses (`hldsexec`, `srcds`, `minecraft_server.jar`, etc.); the IPC stub looks like `startServer(gameId)` returning a handle or process id.
+
 **UI state:**
 ```ts
 type LauncherUI = {
@@ -380,7 +489,20 @@ type LauncherUI = {
 };
 ```
 
-**Persisted settings:** see Settings dialog section. Persist via Tauri's plugin-store or a local JSON file in app data dir.
+**Persisted settings** (mirror of Settings dialog state):
+```ts
+type LauncherSettings = {
+  username: string;
+  language: 'en' | 'de';
+  accent: string;                              // hex from the curated 6-color palette
+  bg: 'flat' | 'gradient' | 'animated';
+  density: 'compact' | 'normal' | 'large';
+  aspect: 'box' | 'square' | 'banner';
+  gameFolder: string | null;                   // v3: moved out of top bar, persists actual path
+};
+```
+
+Persist via Tauri's plugin-store or a local JSON file in app data dir. Changes from the Settings dialog should write through immediately (no Apply button).
 
 **Storage figures:** computed by summing game sizes per state, plus free-space query via Tauri.
 
@@ -448,7 +570,7 @@ Cover art in the design files is **stylized placeholder art** — generated enti
 
 In the production app, the launcher should ideally use real cover-art when available (fetch from IGDB / Steam / local game folder) and fall back to the placeholder generator for games without art. The placeholder generator is in `design_reference/components.jsx → GameCover`.
 
-The icon set (search, play, install, download, folder, kebab, sort, users, close, check, chevron, trash) is in `design_reference/components.jsx → Icon`. They are 12-14px inline SVGs using `currentColor`. Reuse as-is or substitute with the codebase's existing icon library at the same visual weight.
+The icon set (search, play, **server**, install, download, folder, kebab, sort, users, close, check, chevron, trash) is in `design_reference/components.jsx → Icon`. They are 12-14px inline SVGs using `currentColor`. Reuse as-is or substitute with the codebase's existing icon library at the same visual weight. The `server` glyph is new in this round — two stacked rounded rectangles with LED dots, used only on the Start Server button.
 
 Fonts to load:
 ```html
@@ -468,15 +590,20 @@ design_reference/
 ├── data.jsx                ← mock GAMES array + filter/sort helpers + STORAGE mock
 ├── components.jsx          ← Icon, GameCover, StateChip, ActionButton, GameCard,
 │                             SegmentedFilters, UnderlineFilters, SearchField,
-│                             SortMenu, StorageMeter, DirectoryButton, KebabMenu,
-│                             GameDetailModal, SettingsDialog
+│                             SortMenu, StorageMeter, KebabMenu,
+│                             GameDetailModal, SettingsDialog (incl. GameFolderField)
 └── launcher.jsx            ← <Launcher> component composing chrome + grid + modals
 ```
 
 To preview the design in a browser:
 1. Open `SoftLAN Launcher.html` in a static-server (e.g. `python -m http.server` from the folder).
-2. You'll see a design canvas with all variants (A, B, C, D, E) side-by-side. Click an artboard's expand button to view it full-screen.
-3. The "Tweaks" floating panel in the bottom-right is dev-only — it lets you live-change accent / density / aspect / background. In the production app these live in the Settings dialog (variant E).
+2. You'll see a design canvas with all variants (A, B, C, D, E, F) side-by-side. Click an artboard's expand button to view it full-screen.
+   - **A / B** — chrome variants (A is the chosen direction)
+   - **C** — detail overlay for an installed, server-capable game (Counter-Strike 1.6) → shows **Play + Start Server + Uninstall**
+   - **D** — detail overlay for a downloaded-but-not-installed game (CoD 4) → shows **Install + Delete from disk**
+   - **E** — detail overlay for a downloading game (AvP) → shows the live progress component + **Cancel**
+   - **F** — Settings dialog open, with the new **Profile** section at the top
+3. The "Tweaks" floating panel in the bottom-right is dev-only — it lets you live-change every persisted setting (username / language / accent / background / density / aspect / game folder). In the production app these all live in the Settings dialog.
 
 ---
 
@@ -487,3 +614,5 @@ To preview the design in a browser:
 - **Error state on action** — if a Download / Install fails, show inline error on the affected card (red border + retry button), and a toast.
 - **Progress state** — designed. See "Download progress" section above. The action-button slot is swapped for a live `DownloadProgress` component (card + modal variants with container-query fallback for narrow tiles). Wire it to your real progress events; the rendering layer is dev-ready.
 - **Keyboard arrow nav** — arrow keys should move focus between cards in the grid; not implemented in the mock but mentioned as a goal.
+- **"Server running" state** — once Start Server actually spawns a process, the button should switch to a *running* state (live indicator dot + "Server running" label + click-to-stop). Not designed this round — flag for follow-up alongside whatever server-status panel the app grows.
+- **German translations** — the language toggle is wired in Settings, but the catalog of translated UI strings hasn't been compiled. Stand up `react-i18next` (or equivalent) and seed `en.json` from the existing copy; `de.json` is a translation task for whoever owns localization.

design/design_reference/SoftLAN Launcher.html

@@ -35,14 +35,17 @@ const TWEAK_DEFAULTS = /*EDITMODE-BEGIN*/{
   "accent": "#3b82f6",
   "density": "normal",
   "aspect": "square",
-  "bg": "gradient"
+  "bg": "gradient",
+  "username": "ddidderr",
+  "language": "en",
+  "gameFolder": "\/some\/folder\/to\/games"
 }/*EDITMODE-END*/;
 
 const ACCENTS = ['#3b82f6', '#22d3ee', '#a855f7', '#22c55e', '#f59e0b', '#ef4444'];
 
 function App() {
   const [t, setTweak] = useTweaks(TWEAK_DEFAULTS);
-  const heroGame = GAMES.find(g => g.id === 'ra3'); // installed → modal shows Play + Uninstall
+  const heroGame = GAMES.find(g => g.id === 'cs'); // installed + canHostServer → shows Play + Start Server + Uninstall
 
   return (
     <React.Fragment>
@@ -62,7 +65,7 @@ function App() {
 
         <DCSection id="detail" title="Game detail overlay"
                    subtitle="Opens when you click a card. Full description, metadata, primary action + secondary actions (incl. uninstall).">
-          <DCArtboard id="detail-modal" label="C · Detail overlay (installed game)" width={1340} height={840}>
+          <DCArtboard id="detail-modal" label="C · Detail overlay (installed, can host server)" width={1340} height={840}>
             <Launcher variant="single" tweaks={t} setTweak={setTweak}
                       initialFilter="installed" initialSort="az"
                       initialOpenGame={heroGame}/>
@@ -90,6 +93,13 @@ function App() {
       </DesignCanvas>
 
       <TweaksPanel>
+        <TweakSection label="Profile"/>
+        <TweakText label="Username" value={t.username}
+                   onChange={(v) => setTweak('username', v)}/>
+        <TweakRadio label="Language" value={t.language}
+                    options={[{value: 'en', label: 'English'}, {value: 'de', label: 'Deutsch'}]}
+                    onChange={(v) => setTweak('language', v)}/>
+
         <TweakSection label="Theme"/>
         <TweakColor label="Accent" value={t.accent} options={ACCENTS}
                     onChange={(v) => setTweak('accent', v)}/>
@@ -104,6 +114,10 @@ function App() {
         <TweakRadio label="Cover aspect" value={t.aspect}
                     options={['box', 'square', 'banner']}
                     onChange={(v) => setTweak('aspect', v)}/>
+
+        <TweakSection label="Library"/>
+        <TweakText label="Game folder" value={t.gameFolder}
+                   onChange={(v) => setTweak('gameFolder', v)}/>
       </TweaksPanel>
     </React.Fragment>
   );

design/design_reference/components.jsx

@@ -9,6 +9,7 @@ const { useState, useMemo, useRef, useEffect } = React;
 const Icon = {
   search: (p) => <svg viewBox="0 0 16 16" width="14" height="14" fill="none" stroke="currentColor" strokeWidth="1.6" strokeLinecap="round" strokeLinejoin="round" {...p}><circle cx="7" cy="7" r="5"/><path d="m13.5 13.5-3-3"/></svg>,
   play:   (p) => <svg viewBox="0 0 16 16" width="12" height="12" fill="currentColor" {...p}><path d="M4 2.5v11l10-5.5z"/></svg>,
+  server: (p) => <svg viewBox="0 0 16 16" width="13" height="13" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round" {...p}><rect x="2" y="3" width="12" height="4.5" rx="1"/><rect x="2" y="8.5" width="12" height="4.5" rx="1"/><circle cx="4.6" cy="5.25" r=".55" fill="currentColor" stroke="none"/><circle cx="4.6" cy="10.75" r=".55" fill="currentColor" stroke="none"/><path d="M7 5.25h4.5M7 10.75h4.5"/></svg>,
   install:(p) => <svg viewBox="0 0 16 16" width="12" height="12" fill="none" stroke="currentColor" strokeWidth="1.7" strokeLinecap="round" strokeLinejoin="round" {...p}><path d="M8 2v8"/><path d="m4.5 7 3.5 3.5L11.5 7"/><path d="M2.5 12.5h11"/></svg>,
   download:(p)=> <svg viewBox="0 0 16 16" width="12" height="12" fill="none" stroke="currentColor" strokeWidth="1.7" strokeLinecap="round" strokeLinejoin="round" {...p}><path d="M8 2v8"/><path d="m4.5 7 3.5 3.5L11.5 7"/><path d="M2.5 13.5h11"/></svg>,
   folder: (p) => <svg viewBox="0 0 16 16" width="14" height="14" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinejoin="round" {...p}><path d="M1.75 3.75v8.5a1 1 0 0 0 1 1h10.5a1 1 0 0 0 1-1v-7a1 1 0 0 0-1-1H7.5L6 2.75H2.75a1 1 0 0 0-1 1z"/></svg>,
@@ -353,12 +354,17 @@ function StorageMeter({ accent, compact = false }) {
 // Directory button (shows path)
 // ────────────────────────────────────────────────────────────────────
 function DirectoryButton({ path }) {
-  const short = path.length > 36 ? '…' + path.slice(-34) : path;
+  const isSet = !!(path && path.trim());
+  const label = isSet ? 'Game folder' : 'Set game folder';
+  const tooltip = isSet ? path : 'Please select a game folder';
   return (
-    <button className="dirbtn" title={path}>
+    <button
+      className={`dirbtn ${isSet ? 'dirbtn-set' : 'dirbtn-unset'}`}
+      title={tooltip}
+      aria-label={isSet ? `Game folder: ${path}` : 'Set game folder'}
+    >
       <Icon.folder/>
-      <span className="dirbtn-label">Game directory</span>
-      <span className="dirbtn-path">{short}</span>
+      <span className="dirbtn-label">{label}</span>
     </button>
   );
 }
@@ -435,6 +441,13 @@ function GameDetailModal({ game, accent, onClose }) {
           <p className="modal-desc">{game.desc}</p>
           <div className="modal-actions">
             <ActionButton state={game.state} accent={accent} size="lg" game={game}/>
+            {game.canHostServer && game.state === 'installed' && (
+              <button className="act-btn act-lg act-server"
+                      style={{ '--accent': accent }}
+                      onClick={(e) => e.stopPropagation()}>
+                <Icon.server/><span>Start Server</span>
+              </button>
+            )}
             {game.state === 'installed' && (
               <button className="ghost-btn ghost-danger"><Icon.trash/><span>Uninstall</span></button>
             )}
@@ -468,8 +481,22 @@ const SETTING_OPTIONS = {
   bg:      [{ value: 'flat', label: 'Flat' }, { value: 'gradient', label: 'Gradient' }, { value: 'animated', label: 'Animated' }],
   density: [{ value: 'compact', label: 'Compact' }, { value: 'normal', label: 'Normal' }, { value: 'large', label: 'Large' }],
   aspect:  [{ value: 'box', label: 'Box-art' }, { value: 'square', label: 'Square' }, { value: 'banner', label: 'Banner' }],
+  language: [{ value: 'en', label: 'English' }, { value: 'de', label: 'Deutsch' }],
 };
 
+function SettingsTextInput({ value, placeholder, maxLength = 24, onChange, accent }) {
+  return (
+    <div className="settings-text" style={{ '--accent': accent }}>
+      <input type="text"
+             value={value || ''}
+             placeholder={placeholder}
+             maxLength={maxLength}
+             spellCheck={false}
+             onChange={(e) => onChange(e.target.value)}/>
+    </div>
+  );
+}
+
 function SettingsRow({ label, hint, children }) {
   return (
     <div className="settings-row">
@@ -497,6 +524,31 @@ function SegmentedRadio({ value, options, onChange, accent }) {
   );
 }
 
+function GameFolderField({ value, onChange, accent }) {
+  const isSet = !!(value && value.trim());
+  const handleChange = () => {
+    // In production: open native folder picker via Tauri.
+    // For the prototype, prompt for a path so the field is exercisable.
+    const next = window.prompt('Game folder path (leave empty to clear)', value || '');
+    if (next == null) return;
+    onChange(next.trim());
+  };
+  return (
+    <div className={`folder-field ${isSet ? 'is-set' : 'is-unset'}`}
+         style={{ '--accent': accent }}>
+      <span className="folder-field-icon" aria-hidden="true"><Icon.folder/></span>
+      <div className="folder-field-path" title={isSet ? value : 'No folder selected'}>
+        {isSet
+          ? <bdi>{value}</bdi>
+          : <span className="folder-field-empty">Not set</span>}
+      </div>
+      <button type="button" className="folder-field-btn" onClick={handleChange}>
+        {isSet ? 'Change\u2026' : 'Choose\u2026'}
+      </button>
+    </div>
+  );
+}
+
 function ColorSwatchPicker({ value, options, onChange }) {
   return (
     <div className="swatch-row">
@@ -524,6 +576,21 @@ function SettingsDialog({ settings, onChange, onClose }) {
           <button className="modal-close settings-close" onClick={onClose} aria-label="Close"><Icon.close/></button>
         </div>
         <div className="settings-body">
+          <div className="settings-section">
+            <div className="settings-section-title">Profile</div>
+            <SettingsRow label="Username" hint="Shown to other players on the LAN">
+              <SettingsTextInput value={settings.username}
+                                 placeholder="Enter a username"
+                                 onChange={(v) => onChange('username', v)}
+                                 accent={settings.accent}/>
+            </SettingsRow>
+            <SettingsRow label="Language" hint="Interface language">
+              <SegmentedRadio value={settings.language || 'en'}
+                              options={SETTING_OPTIONS.language}
+                              onChange={(v) => onChange('language', v)}
+                              accent={settings.accent}/>
+            </SettingsRow>
+          </div>
           <div className="settings-section">
             <div className="settings-section-title">Appearance</div>
             <SettingsRow label="Accent color" hint="Used for primary actions and highlights">
@@ -540,6 +607,11 @@ function SettingsDialog({ settings, onChange, onClose }) {
           </div>
           <div className="settings-section">
             <div className="settings-section-title">Library</div>
+            <SettingsRow label="Game folder" hint="Parent directory where games are downloaded and installed">
+              <GameFolderField value={settings.gameFolder}
+                               onChange={(v) => onChange('gameFolder', v)}
+                               accent={settings.accent}/>
+            </SettingsRow>
             <SettingsRow label="Grid density" hint="How tightly cards are packed">
               <SegmentedRadio value={settings.density}
                               options={SETTING_OPTIONS.density}

design/design_reference/data.jsx

@@ -28,13 +28,13 @@ const GAMES = [
     cover: { c1: '#ef4444', c2: '#1e3a8a', accent: '#fef08a', mood: 'playful' },
   },
   {
-    id: 'bf1942', title: 'Battlefield 1942', size: 7.8, version: '2016.01.30',
+    id: 'bf1942', title: 'Battlefield 1942', size: 7.8, version: '2016.01.30', canHostServer: true,
     desc: "The original Battlefield. WWII on land, sea, and air across 16 maps. The mod scene basically reinvented PC gaming on top of this engine.",
     state: 'installed', players: '2–64', tags: ['FPS', 'Vehicles', 'LAN'],
     cover: { c1: '#92400e', c2: '#1c1917', accent: '#facc15', mood: 'war' },
   },
   {
-    id: 'bf2', title: 'Battlefield 2 Complete', size: 8.0, version: '2021.12.27',
+    id: 'bf2', title: 'Battlefield 2 Complete', size: 8.0, version: '2021.12.27', canHostServer: true,
     desc: "Modern combat with commander mode, squads, and the kind of jet-vs-jet duels you tell stories about for a decade.",
     state: 'local', players: '2–64', tags: ['FPS', 'Vehicles', 'Tactical'],
     cover: { c1: '#3f3f46', c2: '#0a0a0a', accent: '#22d3ee', mood: 'tactical' },
@@ -46,19 +46,19 @@ const GAMES = [
     cover: { c1: '#f97316', c2: '#7c2d12', accent: '#fde047', mood: 'arcade' },
   },
   {
-    id: 'cod2', title: 'Call of Duty 2', size: 7.0, version: '2016.09.22',
+    id: 'cod2', title: 'Call of Duty 2', size: 7.0, version: '2016.09.22', canHostServer: true,
     desc: "WWII shooter — Russian, British and American campaigns, plus the multiplayer that defined LAN parties for years.",
     state: 'installed', players: '2–32', tags: ['FPS', 'War'],
     cover: { c1: '#57534e', c2: '#1c1917', accent: '#fbbf24', mood: 'war' },
   },
   {
-    id: 'cod4mw', title: 'Call of Duty 4: Modern Warfare', size: 13.0, version: '2016.09.21',
+    id: 'cod4mw', title: 'Call of Duty 4: Modern Warfare', size: 13.0, version: '2016.09.21', canHostServer: true,
     desc: "The shooter that flipped the genre to modern combat and minted a generation of esports careers. All Ghillied Up still holds up.",
     state: 'local', players: '2–32', tags: ['FPS', 'Modern'],
     cover: { c1: '#525252', c2: '#0a0a0a', accent: '#84cc16', mood: 'tactical' },
   },
   {
-    id: 'coduo', title: 'Call of Duty: United Offensive', size: 3.8, version: '2018.09.08',
+    id: 'coduo', title: 'Call of Duty: United Offensive', size: 3.8, version: '2018.09.08', canHostServer: true,
     desc: "Expansion to the original CoD. Battle of the Bulge, Sicily, Kursk. Adds tanks, B-17 sequences, and the flamethrower nobody asked for but everybody loved.",
     state: 'none', players: '2–32', tags: ['FPS', 'Expansion'],
     cover: { c1: '#78716c', c2: '#292524', accent: '#fb923c', mood: 'war' },
@@ -76,37 +76,37 @@ const GAMES = [
     cover: { c1: '#a16207', c2: '#422006', accent: '#facc15', mood: 'war' },
   },
   {
-    id: 'cs', title: 'Counter-Strike 1.6', size: 0.7, version: '2014.01.21',
+    id: 'cs', title: 'Counter-Strike 1.6', size: 0.7, version: '2014.01.21', canHostServer: true,
     desc: "The 1.6 build still everyone insists was the peak. Terrorists vs Counter-Terrorists, AWP camping, de_dust2.",
     state: 'installed', players: '2–32', tags: ['FPS', 'Competitive', 'LAN'],
     cover: { c1: '#1e40af', c2: '#0c1f3a', accent: '#fbbf24', mood: 'tactical' },
   },
   {
-    id: 'css', title: 'Counter-Strike: Source', size: 4.3, version: '2014.10.23',
+    id: 'css', title: 'Counter-Strike: Source', size: 4.3, version: '2014.10.23', canHostServer: true,
     desc: "CS reborn on the Source engine. Same maps, same rules, with physics that lets the molotovs work properly.",
     state: 'installed', players: '2–32', tags: ['FPS', 'Competitive'],
     cover: { c1: '#1d4ed8', c2: '#0c1f3a', accent: '#f59e0b', mood: 'tactical' },
   },
   {
-    id: 'cube2', title: 'Cube 2: Sauerbraten', size: 0.4, version: '2013.09.20',
+    id: 'cube2', title: 'Cube 2: Sauerbraten', size: 0.4, version: '2013.09.20', canHostServer: true,
     desc: "Open-source arena FPS with in-game level editing. Fast, free, and one of those things every LAN party always had a copy of.",
     state: 'none', players: '2–16', tags: ['FPS', 'Open Source'],
     cover: { c1: '#dc2626', c2: '#7f1d1d', accent: '#f1f5f9', mood: 'arcade' },
   },
   {
-    id: 'doom3', title: 'Doom 3', size: 2.2, version: '2012.01.31',
+    id: 'doom3', title: 'Doom 3', size: 2.2, version: '2012.01.31', canHostServer: true,
     desc: "Sci-fi horror reboot of the franchise. Mars Research Facility, demonic incursion, the shotgun that started a flashlight debate.",
     state: 'local', players: '2–16', tags: ['FPS', 'Horror'],
     cover: { c1: '#7f1d1d', c2: '#000000', accent: '#f97316', mood: 'dark' },
   },
   {
-    id: 'l4d2', title: 'Left 4 Dead 2', size: 6.5, version: '2020.08.15',
+    id: 'l4d2', title: 'Left 4 Dead 2', size: 6.5, version: '2020.08.15', canHostServer: true,
     desc: "Co-op zombie survival with the AI Director rewriting every campaign run. Bring four friends or four strangers; the chainsaw works the same.",
     state: 'installed', players: '1–8', tags: ['Co-op', 'FPS', 'Horror'],
     cover: { c1: '#15803d', c2: '#052e16', accent: '#fef08a', mood: 'horror' },
   },
   {
-    id: 'minecraft', title: 'Minecraft', size: 1.0, version: '2024.03.01',
+    id: 'minecraft', title: 'Minecraft', size: 1.0, version: '2024.03.01', canHostServer: true,
     desc: "Infinite voxel sandbox. Build, mine, survive, get blown up by a creeper. The LAN button is right there.",
     state: 'installed', players: '2–100', tags: ['Sandbox', 'Survival', 'LAN'],
     cover: { c1: '#15803d', c2: '#7c2d12', accent: '#fde68a', mood: 'sandbox' },
@@ -118,7 +118,7 @@ const GAMES = [
     cover: { c1: '#ea580c', c2: '#1e293b', accent: '#22d3ee', mood: 'tech' },
   },
   {
-    id: 'quake3', title: 'Quake III Arena', size: 0.5, version: '2010.08.15',
+    id: 'quake3', title: 'Quake III Arena', size: 0.5, version: '2010.08.15', canHostServer: true,
     desc: "Arena FPS in its most distilled form. Rocket jumps, rail-gun duels, and a netcode that's still the benchmark.",
     state: 'downloading', progress: 0.71, speed: 12.8, peers: 3, players: '2–16', tags: ['FPS', 'Arena', 'LAN'],
     cover: { c1: '#7f1d1d', c2: '#0a0a0a', accent: '#fbbf24', mood: 'dark' },
@@ -130,13 +130,13 @@ const GAMES = [
     cover: { c1: '#1e3a8a', c2: '#172554', accent: '#22d3ee', mood: 'scifi' },
   },
   {
-    id: 'tf2', title: 'Team Fortress 2', size: 22.0, version: '2023.06.18',
+    id: 'tf2', title: 'Team Fortress 2', size: 22.0, version: '2023.06.18', canHostServer: true,
     desc: "Class-based shooter with nine archetypes, absurd hats, and a meta with more history than most actual sports.",
     state: 'local', players: '2–32', tags: ['FPS', 'Class-based'],
     cover: { c1: '#b45309', c2: '#7c2d12', accent: '#fbbf24', mood: 'cartoon' },
   },
   {
-    id: 'ut2k4', title: 'Unreal Tournament 2004', size: 5.2, version: '2012.06.01',
+    id: 'ut2k4', title: 'Unreal Tournament 2004', size: 5.2, version: '2012.06.01', canHostServer: true,
     desc: "Arena shooter at maximum velocity. Onslaught, Assault, Bombing Run — vehicles, jump boots, the announcer screaming HEADSHOT.",
     state: 'none', players: '2–32', tags: ['FPS', 'Arena'],
     cover: { c1: '#854d0e', c2: '#422006', accent: '#fde047', mood: 'arena' },

design/design_reference/launcher.jsx

@@ -1,8 +1,6 @@
 // launcher.jsx — composes top bar + grid into a complete launcher screen
 // Comes in two chrome variants: 'single' (one-row) and 'two' (two-row).
 
-const DIR_PATH = '/home/pfs/Desktop/eti_games_AFTER_LAN_2025';
-
 function applyFilterAndSort(games, filter, sort, query) {
   let g = filterGames(games, filter);
   if (query.trim()) {
@@ -51,15 +49,26 @@ function Launcher({
          style={{ '--accent': accent }}>
       {variant === 'single' ? (
         <header className="topbar topbar-single">
-          <div className="brand">
-            <div className="brand-mark" style={{ background: accent }}>S</div>
-            <div className="brand-name">SoftLAN</div>
+          <div className="topbar-left">
+            <div className="brand">
+              <div className="brand-mark" style={{ background: accent }}>S</div>
+              <div className="brand-name">SoftLAN</div>
+            </div>
+            <div className="topbar-left-trail">
+              <SegmentedFilters value={filter} onChange={setFilter} counts={counts} accent={accent}/>
+            </div>
+          </div>
+          <div className="topbar-center">
+            <SearchField value={query} onChange={setQuery} accent={accent} wide/>
+          </div>
+          <div className="topbar-right">
+            <div className="topbar-right-lead">
+              <SortMenu value={sort} onChange={setSort} accent={accent}/>
+            </div>
+            <div className="topbar-right-trail">
+              <KebabMenu items={menuItems}/>
+            </div>
           </div>
-          <SegmentedFilters value={filter} onChange={setFilter} counts={counts} accent={accent}/>
-          <SearchField value={query} onChange={setQuery} accent={accent} wide/>
-          <SortMenu value={sort} onChange={setSort} accent={accent}/>
-          <DirectoryButton path={DIR_PATH}/>
-          <KebabMenu items={menuItems}/>
         </header>
       ) : (
         <header className="topbar topbar-two">
@@ -68,7 +77,6 @@ function Launcher({
               <div className="brand-mark" style={{ background: accent }}>S</div>
               <div className="brand-name">SoftLAN <span className="brand-name-soft">Launcher</span></div>
             </div>
-            <DirectoryButton path={DIR_PATH}/>
             <div className="topbar-row1-right">
               <StorageMeter accent={accent}/>
               <KebabMenu items={menuItems}/>

design/design_reference/styles.css

@@ -41,6 +41,8 @@
   color: var(--t-1);
   font-family: var(--font-ui);
   font-size: 13px;
+  container-type: inline-size;
+  container-name: launcher;
   line-height: 1.4;
   overflow: hidden;
   position: relative;
@@ -77,13 +79,70 @@
   border-bottom: 1px solid var(--bd-1);
 }
 
-/* Variant 1: single row */
+/* Variant 1: single row — three visual zones with search at geometric center */
 .topbar-single {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
+  align-items: center;
+  column-gap: 16px;
+  padding: 14px 24px;
+}
+.topbar-single .topbar-left {
   display: flex;
   align-items: center;
-  gap: 18px;
-  padding: 14px 24px;
-  flex-wrap: nowrap;
+  justify-content: space-between;
+  gap: 16px;
+  min-width: 0;
+}
+.topbar-single .topbar-left-trail {
+  display: flex;
+  align-items: center;
+  min-width: 0;
+}
+.topbar-single .topbar-center {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-width: 0;
+}
+.topbar-single .topbar-center .search { flex: 0 1 360px; min-width: 0; }
+.topbar-single .topbar-right {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  min-width: 0;
+}
+.topbar-single .topbar-right-lead {
+  display: flex;
+  align-items: center;
+  min-width: 0;
+}
+.topbar-single .topbar-right-trail {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  min-width: 0;
+}
+
+/* When the launcher gets narrow, the three-zone centering breaks down —
+   collapse to a single left-to-right flowing row. */
+@container launcher (max-width: 1100px) {
+  .topbar-single {
+    display: flex;
+    flex-wrap: nowrap;
+    gap: 16px;
+  }
+  .topbar-single .topbar-left,
+  .topbar-single .topbar-center,
+  .topbar-single .topbar-right,
+  .topbar-single .topbar-right-trail {
+    justify-content: flex-start;
+    flex: 0 0 auto;
+    gap: 12px;
+  }
+  .topbar-single .topbar-center { flex: 1 1 200px; }
+  .topbar-single .topbar-center .search { flex: 1 1 auto; }
 }
 
 /* Variant 2: two row */
@@ -307,29 +366,27 @@
 
 /* ─── Directory button ─── */
 .dirbtn {
+  position: relative;
   display: inline-flex; align-items: center; gap: 8px;
-  height: 36px; padding: 0 12px;
+  height: 36px; padding: 0 14px 0 12px;
   background: var(--bg-2);
   border: 1px solid var(--bd-1);
   border-radius: 8px;
-  color: var(--t-2);
-  font: inherit; font-size: 12.5px;
+  color: var(--t-1);
+  font: inherit; font-size: 12.5px; font-weight: 600;
   cursor: pointer;
-  max-width: 360px;
-  transition: border-color .15s, color .15s;
-  flex-shrink: 1;
-  min-width: 0;
-}
-.dirbtn:hover { border-color: var(--bd-2); color: var(--t-1); }
-.dirbtn-label { color: var(--t-1); font-weight: 600; flex-shrink: 0; }
-.dirbtn-path {
-  color: var(--t-3);
-  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
-  font-size: 11.5px;
+  transition: border-color .15s, color .15s, background .15s;
+  flex-shrink: 0;
   white-space: nowrap;
-  overflow: hidden;
-  text-overflow: ellipsis;
-  min-width: 0;
+}
+.dirbtn:hover { border-color: var(--bd-2); }
+.dirbtn-label { line-height: 1; }
+.dirbtn-unset {
+  border-color: color-mix(in srgb, var(--danger) 35%, var(--bd-1));
+}
+.dirbtn-unset:hover {
+  border-color: color-mix(in srgb, var(--danger) 55%, var(--bd-2));
+  background: color-mix(in srgb, var(--danger) 8%, var(--bg-2));
 }
 
 /* ─── Kebab menu ─── */
@@ -630,6 +687,22 @@
 }
 .act-download:hover { background: rgba(255,255,255,0.12); border-color: var(--bd-3); }
 
+/* Start Server — secondary "primary" action sitting next to Play.
+   Uses the accent as a tinted fill + border so it reads as host-action
+   without competing with the green Play button. */
+.act-server {
+  color: var(--t-1);
+  background: color-mix(in srgb, var(--accent) 14%, rgba(255,255,255,0.04));
+  border: 1px solid color-mix(in srgb, var(--accent) 55%, transparent);
+  box-shadow: inset 0 1px 0 rgba(255,255,255,0.06);
+}
+.act-server:hover {
+  background: color-mix(in srgb, var(--accent) 22%, rgba(255,255,255,0.04));
+  border-color: color-mix(in srgb, var(--accent) 75%, transparent);
+  filter: none;
+}
+.act-server svg { color: var(--accent); }
+
 /* ─── Download progress (in place of action button when state === 'downloading') ─── */
 .dl {
   position: relative;
@@ -1135,3 +1208,106 @@
   color: white;
   box-shadow: 0 2px 8px -2px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.18);
 }
+
+/* ─── Settings: text input ─── */
+.settings-text {
+  display: inline-flex;
+  align-items: center;
+  background: var(--bg-3);
+  border: 1px solid var(--bd-1);
+  border-radius: 8px;
+  padding: 0 12px;
+  height: 36px;
+  width: 220px;
+  transition: border-color .15s, box-shadow .15s, background .15s;
+}
+.settings-text:focus-within {
+  background: var(--bg-2);
+  border-color: var(--accent, #3b82f6);
+  box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent, #3b82f6) 22%, transparent);
+}
+.settings-text input {
+  flex: 1; min-width: 0;
+  background: transparent;
+  border: 0; outline: 0;
+  color: var(--t-1);
+  font: inherit;
+  font-size: 13.5px;
+  font-weight: 600;
+  letter-spacing: 0.1px;
+}
+.settings-text input::placeholder {
+  color: var(--t-3);
+  font-weight: 500;
+}
+
+/* ─── Settings: game-folder field ─── */
+.folder-field {
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  width: 340px;
+  height: 36px;
+  padding: 0 4px 0 12px;
+  background: var(--bg-3);
+  border: 1px solid var(--bd-1);
+  border-radius: 8px;
+  transition: border-color .15s, background .15s;
+}
+.folder-field:hover { border-color: var(--bd-2); }
+.folder-field.is-unset {
+  border-color: color-mix(in srgb, var(--danger) 35%, var(--bd-1));
+  background: color-mix(in srgb, var(--danger) 6%, var(--bg-3));
+}
+.folder-field.is-unset:hover {
+  border-color: color-mix(in srgb, var(--danger) 55%, var(--bd-2));
+}
+.folder-field-icon {
+  display: inline-flex;
+  color: var(--t-3);
+  flex-shrink: 0;
+}
+.folder-field.is-unset .folder-field-icon { color: #f87171; }
+.folder-field-path {
+  flex: 1;
+  min-width: 0;
+  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
+  font-size: 12px;
+  color: var(--t-1);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  direction: rtl;          /* truncate from the head so the leaf folder stays visible */
+  text-align: left;
+  unicode-bidi: plaintext; /* keep character order intact */
+}
+.folder-field-empty {
+  font-family: var(--font-ui);
+  font-size: 12.5px;
+  font-weight: 600;
+  color: #f87171;
+  letter-spacing: 0.1px;
+}
+.folder-field-btn {
+  flex-shrink: 0;
+  height: 28px;
+  padding: 0 12px;
+  border: 0;
+  border-radius: 6px;
+  background: rgba(255,255,255,0.06);
+  color: var(--t-1);
+  font: inherit;
+  font-size: 12.5px;
+  font-weight: 600;
+  letter-spacing: 0.1px;
+  cursor: pointer;
+  transition: background .15s, color .15s;
+}
+.folder-field-btn:hover { background: rgba(255,255,255,0.12); }
+.folder-field.is-unset .folder-field-btn {
+  background: color-mix(in srgb, var(--accent, #3b82f6) 85%, transparent);
+  color: #fff;
+}
+.folder-field.is-unset .folder-field-btn:hover {
+  background: var(--accent, #3b82f6);
+}