fix(peer): refresh settled install state after operations

The follow-up review found a few stale lifecycle edges around local game
transactions. Recovery could sweep active roots, post-operation refreshes
still re-ran full startup recovery, and the UI kept inferring local-only state
from downloaded and installed flags instead of the backend availability.

This updates the peer lifecycle so startup recovery skips active operations,
install/update/uninstall refresh only the affected game after the operation
guard is dropped, and path-changing game-directory updates are rejected while
operations are active. It also removes the dead UpdateGame command, drops the
unused manifest_hash write field while preserving old JSON reads, renames the
internal install-finished event, and carries availability through the DB,
peer summaries, Tauri refreshes, and the React model.

The included follow-up documents record the review source, implementation
decisions, and the remaining FOLLOW_UP_2.md work so later commits can stay
small instead of reopening the completed plan items.

Test Plan:
- git diff --check
- just fmt
- just clippy
- just test

Follow-up-Plan: FOLLOW_UP_PLAN.md

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

@@ -1,4 +1,5 @@
 use std::{
+    collections::HashSet,
     io::ErrorKind,
     path::{Path, PathBuf},
     sync::Arc,
@@ -115,7 +116,7 @@ pub async fn uninstall(game_root: &Path, id: &str) -> eyre::Result<()> {
     }
 }
 
-pub async fn recover_on_startup(game_dir: &Path) -> eyre::Result<()> {
+pub async fn recover_on_startup(game_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 {
@@ -135,6 +136,10 @@ pub async fn recover_on_startup(game_dir: &Path) -> eyre::Result<()> {
         if id == ".lanspread" {
             continue;
         }
+        if active_ids.contains(&id) {
+            log::debug!("Skipping recovery for active game root {id}");
+            continue;
+        }
 
         recover_game_root(&entry.path(), &id).await?;
     }
@@ -457,6 +462,7 @@ impl From<bool> for FsEntryState {
 #[cfg(test)]
 mod tests {
     use std::{
+        collections::HashSet,
         path::{Path, PathBuf},
         sync::{Arc, Mutex},
     };
@@ -551,6 +557,29 @@ mod tests {
         assert_eq!(intent.state, InstallIntentState::None);
     }
 
+    #[tokio::test]
+    async fn install_unpacks_multiple_root_eti_archives_in_sorted_order() {
+        let temp = TempDir::new();
+        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())
+            .await
+            .expect("install should succeed");
+
+        let archives = unpacker
+            .archives
+            .lock()
+            .expect("archive list should not be poisoned")
+            .iter()
+            .filter_map(|path| path.file_name()?.to_str().map(ToOwned::to_owned))
+            .collect::<Vec<_>>();
+        assert_eq!(archives, vec!["a.eti", "b.eti"]);
+    }
+
     #[tokio::test]
     async fn update_failure_restores_previous_local() {
         let temp = TempDir::new();
@@ -571,6 +600,26 @@ mod tests {
         assert_eq!(intent.state, InstallIntentState::None);
     }
 
+    #[tokio::test]
+    async fn update_success_promotes_new_local_and_removes_backup() {
+        let temp = TempDir::new();
+        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())
+            .await
+            .expect("update should succeed");
+
+        assert!(root.join("local").join("payload.txt").is_file());
+        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;
+        assert_eq!(intent.state, InstallIntentState::None);
+    }
+
     #[tokio::test]
     async fn uninstall_removes_only_local_install() {
         let temp = TempDir::new();
@@ -648,4 +697,20 @@ mod tests {
         assert!(!root.join(VERSION_TMP_FILE).exists());
         assert!(!root.join(VERSION_DISCARDED_FILE).exists());
     }
+
+    #[tokio::test]
+    async fn startup_recovery_skips_active_game_roots() {
+        let temp = TempDir::new();
+        let active_root = temp.0.join("active");
+        let inactive_root = temp.0.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.0, &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());
+    }
 }