fix: chess unmount cleanup, notification click routing, remove dead disconnect calls

Phase 1.13: add unmountGame export for chess — stops clock, destroys board,
nulls gameState on scene exit.

Phase 5.1: notification items now navigate to relevant section on click
(friends, play, tournaments, achievements based on type).

Phase 6.6: remove remaining stopDisconnectWatch calls from domino/ludo
since disconnect detection is now fully handled by match-session.js.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

public/js/modules/chess/mod.js

 import * as scene from '../../core/scene.js';
-import { mountGame } from './scenes/game.js';
+import { mountGame, unmountGame } from './scenes/game.js';
 import { mountResult } from './scenes/result.js';
 import { mountAnalysis } from './scenes/analysis.js';
 import { mountHistory } from './scenes/history.js';
 import { mountReview } from './scenes/review.js';
 import { mountSpectate } from './scenes/spectate.js';
 
-scene.register('chess-game', mountGame);
+scene.register('chess-game', mountGame, unmountGame);
 scene.register('chess-result', mountResult);
 scene.register('chess-analysis', mountAnalysis);
 scene.register('chess-history', mountHistory);

public/js/modules/chess/scenes/game.js

@@ -996,3 +996,8 @@ function reportTournamentResult(result) {
   }).catch(e => console.warn('[tournament] report error:', e));
 }
 
+export function unmountGame() {
+  if (clock) { clock.stop(); clock = null; }
+  if (board) { board.destroy?.(); board = null; }
+  gameState = null;
+}

public/js/modules/domino/scenes/game.js

@@ -1009,7 +1009,7 @@ function endMatch(el, result, reason) {
   state.gameOver = true;
 
   liveSession?.cleanup?.();
-  mp.stopDisconnectWatch?.();
+
 
   if (result === 'win') {
     audio.play('win', 'reward');
@@ -1307,7 +1307,7 @@ export function unmountGame() {
   if (botTimeout) { clearTimeout(botTimeout); botTimeout = null; }
   if (autoPassTimeout) { clearTimeout(autoPassTimeout); autoPassTimeout = null; }
   liveSession?.cleanup?.();
-  mp.stopDisconnectWatch?.();
+
   board?.destroy();
   hand?.destroy();
   drag?.destroy();

public/js/modules/ludo/scenes/game.js

@@ -1384,7 +1384,7 @@ async function handleExit(el) {
 
   if (game.mode === 'live' && matchId) {
     net.post('ludo-match.php', { action: 'leave', match_id: matchId, player_index: myPlayerIndex }).catch(() => {});
-    mp.stopDisconnectWatch();
+
     stopLudoPolling();
     if (heartbeatTimer) { clearInterval(heartbeatTimer); heartbeatTimer = null; }
     localStorage.removeItem('el3ab_active_match');

public/js/modules/social/scenes/notifications.js

 import * as net from '../../../core/net.js';
 import * as store from '../../../core/store.js';
+import * as scene from '../../../core/scene.js';
+import * as bus from '../../../core/bus.js';
 import { t } from '../../../core/i18n.js';
 
 export async function mountNotifications(el) {
@@ -45,6 +47,24 @@ function renderNotifications(el, notifications) {
     notifications.forEach(n => n.is_read = true);
     renderNotifications(el, notifications);
   });
+
+  list.querySelectorAll('.notif-item').forEach(item => {
+    item.addEventListener('click', () => {
+      const id = item.dataset.id;
+      const notif = notifications.find(n => n.id === id);
+      if (!notif) return;
+      const type = notif.type || notif.notification_type || '';
+      if (type === 'friend_request' || type === 'friend_accept') {
+        bus.emit('navigate', { world: 'social', scene: 'friends' });
+      } else if (type === 'match_invite' || type === 'challenge') {
+        bus.emit('navigate', { world: 'play' });
+      } else if (type === 'tournament') {
+        bus.emit('navigate', { world: 'tournaments' });
+      } else if (type === 'achievement') {
+        scene.push('achievements');
+      }
+    });
+  });
 }
 
 function timeAgo(date) {