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-tauri-deno-ts/src/App.tsx

@@ -40,6 +40,7 @@ interface Game {
     thumbnail: Uint8Array | number[];
     downloaded: boolean;
     installed: boolean;
+    availability: GameAvailability;
     install_status: InstallStatus;
     eti_game_version?: string;
     local_version?: string;
@@ -48,6 +49,12 @@ interface Game {
     peer_count: number;
 }
 
+enum GameAvailability {
+    Ready = 'Ready',
+    Downloading = 'Downloading',
+    LocalOnly = 'LocalOnly',
+}
+
 interface GameThumbnailProps {
     gameId: string;
     alt: string;
@@ -105,6 +112,7 @@ const mergeGameUpdate = (game: Game, previous?: Game): Game => {
 
     return {
         ...game,
+        availability: game.availability ?? (game.downloaded ? GameAvailability.Ready : GameAvailability.LocalOnly),
         install_status: installStatus,
         status_message: localStateChanged ? undefined : previous?.status_message,
         status_level: localStateChanged ? undefined : previous?.status_level,
@@ -289,11 +297,11 @@ const App = () => {
     }, [gameDir]);
 
     useEffect(() => {
-        // Listen for game-unpack-finished events specifically
-        const setupUnpackListener = async () => {
-            const unlisten = await listen('game-unpack-finished', (event) => {
+        // Listen for game-install-finished events specifically
+        const setupInstallFinishedListener = async () => {
+            const unlisten = await listen('game-install-finished', (event) => {
                 const game_id = event.payload as string;
-                console.log(`🗲 game-unpack-finished ${game_id} event received`);
+                console.log(`🗲 game-install-finished ${game_id} event received`);
                 clearCheckingPeersTimeout(game_id);
                 setGameItems(prev => prev.map(item => item.id === game_id
                     ? {
@@ -316,7 +324,7 @@ const App = () => {
             return unlisten;
         };
 
-        setupUnpackListener();
+        setupInstallFinishedListener();
     }, [gameDir]);
 
     useEffect(() => {
@@ -739,7 +747,7 @@ const App = () => {
                             <span className="size-text">{(item.size / 1024 / 1024 / 1024).toFixed(1)} GB</span>
                         </div>
                         <div className="badges">
-                            {item.installed && !item.downloaded && (
+                            {item.installed && item.availability === GameAvailability.LocalOnly && (
                                 <span className="badge local-only">LocalOnly</span>
                             )}
                             {!item.installed && item.downloaded && item.local_version && (