fix(extension): ensureState timeout guard, skip queued LEAVE_ROOM, persist onclose state, cleanup forceSync timer

- Add 10s timeout to ensureState() so extension doesn't hang forever if
  chrome.storage.session.get() never calls back (storage API failure)
- Skip emit(LEAVE_ROOM) in leaveOldRoomIfSwitching when socket is down;
  server already cleaned up via disconnect handler, avoid queued no-op
- Persist cleared peers to storage in socket.onclose to prevent stale
  peer list restoration on service worker restart
- Store and clean up forceSyncReset setTimeout in popup unload handler
  and when force_sync_execute completes

extension/background.js

@@ -22,12 +22,22 @@ let restorationTask = null;
 function ensureState() {
     if (!restorationTask) {
         restorationTask = new Promise(resolve => {
+            let resolved = false;
+            const done = () => { if (!resolved) { resolved = true; resolve(); } };
+
+            const storageTimeout = setTimeout(() => {
+                addLog('Storage restoration timed out, continuing with defaults', 'warn');
+                storageInitialized = true;
+                done();
+            }, 10000);
+
             chrome.storage.session.get([
                 'logs', 'history', 'currentRoom', 'lastActionState', 
                 'eventQueue', 'isForceSyncInitiator', 'forceSyncAcks', 
                 'forceSyncDeadline', 'reconnectFailed', 'reconnectStartTime', 'currentTabId', 'currentTabTitle',
                 'episodeLobby'
             ], (data) => {
+                clearTimeout(storageTimeout);
                 if (data.currentTabId !== undefined) currentTabId = data.currentTabId;
                 if (data.currentTabTitle !== undefined) currentTabTitle = data.currentTabTitle;
                 // Merge data from storage with any early-arriving state
@@ -88,7 +98,7 @@ function ensureState() {
                     pendingHistory = [];
                 }
 
-                resolve();
+                done();
             });
         });
     }
@@ -369,6 +379,7 @@ async function connect() {
             
             if (currentRoom) {
                 currentRoom.peers = [];
+                if (storageInitialized) chrome.storage.session.set({ currentRoom });
                 chrome.runtime.sendMessage({ type: 'PEER_UPDATE', peers: [] }).catch(() => {});
             }
             broadcastConnectionStatus('disconnected');
@@ -959,7 +970,9 @@ chrome.alarms.onAlarm.addListener(async (alarm) => {
 function leaveOldRoomIfSwitching(newRoomId) {
     if (currentRoom && currentRoom.roomId !== newRoomId) {
         addLog(`Switching rooms: leaving ${currentRoom.roomId} to join ${newRoomId}`, 'info');
-        emit(EVENTS.LEAVE_ROOM, { peerId });
+        if (socket && socket.readyState === WebSocket.OPEN && isNamespaceJoined) {
+            emit(EVENTS.LEAVE_ROOM, { peerId });
+        }
         currentRoom = null;
         if (storageInitialized) chrome.storage.session.set({ currentRoom: null });
         chrome.runtime.sendMessage({ type: 'PEER_UPDATE', peers: [] }).catch(() => {});

extension/popup.js

@@ -54,6 +54,7 @@ let lastPeersJson = null;
 let lastKnownPeers = [];
 let isDevTabVisible = false;
 let joinBtnTimeout = null;
+let forceSyncResetTimer = null;
 let popupIntervals = [];
 let populateTabsToken = null;
 let forceSyncDone = false;
@@ -974,8 +975,7 @@ elements.forceSyncBtn.addEventListener('click', async () => {
             elements.forceSyncBtn.textContent = originalText;
         }
     };
-    setTimeout(forceSyncReset, 12000);
+    forceSyncResetTimer = setTimeout(forceSyncReset, 12000);
-
     const tabId = parseInt(status.targetTabId);
 
     const sendForceSync = (time) => {
@@ -1096,6 +1096,10 @@ chrome.runtime.onMessage.addListener((msg) => {
         }
         if (state && state.action === 'force_sync_execute') {
             forceSyncDone = true;
+            if (forceSyncResetTimer) {
+                clearTimeout(forceSyncResetTimer);
+                forceSyncResetTimer = null;
+            }
             if (elements.forceSyncBtn) {
                 elements.forceSyncBtn.disabled = false;
                 elements.forceSyncBtn.textContent = '⚡ Force Sync';
@@ -1259,6 +1263,10 @@ window.addEventListener('unload', () => {
         clearTimeout(joinBtnTimeout);
         joinBtnTimeout = null;
     }
+    if (forceSyncResetTimer) {
+        clearTimeout(forceSyncResetTimer);
+        forceSyncResetTimer = null;
+    }
 });
 
 // --- Episode Lobby UI ---