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-db/src/db.rs

@@ -5,6 +5,10 @@ use std::{collections::HashMap, fmt, path::Path};
 
 use serde::{Deserialize, Serialize};
 
+pub const AVAILABILITY_READY: &str = "Ready";
+pub const AVAILABILITY_DOWNLOADING: &str = "Downloading";
+pub const AVAILABILITY_LOCAL_ONLY: &str = "LocalOnly";
+
 /// Read version from version.ini file
 /// # Errors
 /// Returns error if file cannot be read or parsed
@@ -30,6 +34,10 @@ pub fn read_version_from_ini(game_dir: &Path) -> eyre::Result<Option<String>> {
     }
 }
 
+fn default_availability() -> String {
+    AVAILABILITY_LOCAL_ONLY.to_string()
+}
+
 /// A game
 #[derive(Clone, Serialize, Deserialize)]
 pub struct Game {
@@ -57,6 +65,9 @@ pub struct Game {
     /// only relevant for client (yeah... I know)
     #[serde(default)]
     pub installed: bool,
+    /// Backend-reported availability state for this game's local or peer summary.
+    #[serde(default = "default_availability")]
+    pub availability: String,
     /// ETI game version from version.ini (YYYYMMDD format) (server)
     pub eti_game_version: Option<String>,
     /// Local game version from version.ini (YYYYMMDD format)
@@ -157,6 +168,7 @@ impl GameDB {
         for game in self.games.values_mut() {
             game.downloaded = false;
             game.installed = false;
+            game.availability = AVAILABILITY_LOCAL_ONLY.to_string();
             game.local_version = None;
         }
     }
@@ -207,7 +219,7 @@ impl fmt::Debug for GameFileDescription {
 mod tests {
     use serde_json::json;
 
-    use super::{Game, GameFileDescription};
+    use super::{AVAILABILITY_LOCAL_ONLY, Game, GameFileDescription};
 
     #[test]
     fn installed_defaults_to_false_when_missing() {
@@ -234,6 +246,7 @@ mod tests {
             !game.installed,
             "missing installed flag should default to false"
         );
+        assert_eq!(game.availability, AVAILABILITY_LOCAL_ONLY);
     }
 
     #[test]
@@ -262,4 +275,15 @@ mod tests {
         };
         assert!(!other_game.is_version_ini());
     }
+
+    #[test]
+    fn version_ini_predicate_accepts_windows_separators() {
+        let root = GameFileDescription {
+            game_id: "aoe2".to_string(),
+            relative_path: r"aoe2\version.ini".to_string(),
+            is_dir: false,
+            size: 8,
+        };
+        assert!(root.is_version_ini());
+    }
 }