fix: include native-bridge.js that engine.js imports

Missing file caused blank screen after deploy.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

public/js/core/native-bridge.js

+import * as bus from './bus.js';
+import * as store from './store.js';
+import * as scene from './scene.js';
+import * as input from './input.js';
+
+let bridge = null;
+
+export function init() {
+  if (!window.flutter_bridge) return;
+
+  bridge = window.flutter_bridge;
+
+  // Mark as native app — CSS uses this to hide web bottom nav
+  document.documentElement.classList.add('native-app');
+  window.IS_NATIVE_APP = true;
+
+  // Register handler object for Flutter → Web calls
+  window.el3ab_native = {
+    onDeepLink: handleDeepLink,
+    onPushTap: handlePushTap,
+    onConnectivityChanged: handleConnectivity,
+    onTokenRefreshed: handleTokenRefresh,
+    onNavTap: handleNavTap,
+  };
+
+  // Override haptic to use native
+  if (input.haptic) {
+    const originalHaptic = input.haptic;
+    input.haptic = (type) => {
+      send('haptic', { type: type || 'light' });
+      originalHaptic(type);
+    };
+  }
+
+  // Listen for auth events to notify Flutter
+  bus.on('auth:success', () => {
+    const token = store.get('auth.token');
+    const userId = store.get('auth.userId');
+    send('auth_ready', { token, userId });
+  });
+
+  bus.on('auth:logout', () => {
+    send('auth_logout', {});
+  });
+
+  // Listen for world/nav changes to sync Flutter bottom bar
+  bus.on('scene:world_changed', (world) => {
+    send('nav_sync', { world, gameMode: false });
+  });
+
+  // Listen for game mode enter/exit
+  bus.on('game:enter', () => {
+    send('nav_sync', { world: 'play', gameMode: true });
+  });
+
+  bus.on('game:exit', () => {
+    const world = store.get('activeWorld') || 'play';
+    send('nav_sync', { world, gameMode: false });
+  });
+
+  // Listen for notification badge updates
+  bus.on('notifications:count', (count) => {
+    send('badge', { count });
+  });
+
+  console.log('[Native Bridge] Initialized');
+}
+
+function send(cmd, data) {
+  if (!bridge) return;
+  bridge.postMessage(JSON.stringify({ cmd, ...data }));
+}
+
+function handleDeepLink(data) {
+  const { route, id } = data;
+  switch (route) {
+    case 'match':
+      bus.emit('native:open_match', id);
+      break;
+    case 'invite':
+      bus.emit('native:accept_invite', id);
+      break;
+    case 'tournament':
+      scene.switchWorld('tournaments');
+      bus.emit('native:open_tournament', id);
+      break;
+    case 'profile':
+      scene.switchWorld('profile');
+      bus.emit('native:open_profile', id);
+      break;
+    case 'play':
+      scene.switchWorld('play');
+      break;
+    default:
+      scene.switchWorld('play');
+  }
+}
+
+function handlePushTap(data) {
+  const { type, match_id, route } = data;
+  switch (type) {
+    case 'match_invite':
+    case 'your_turn':
+    case 'match_result':
+      if (match_id) bus.emit('native:open_match', match_id);
+      break;
+    case 'tournament_start':
+      scene.switchWorld('tournaments');
+      break;
+    case 'friend_online':
+      scene.switchWorld('social');
+      break;
+    case 'chat_message':
+      scene.switchWorld('social');
+      break;
+    default:
+      if (route) {
+        const segments = route.split('/').filter(Boolean);
+        if (segments.length >= 1) handleDeepLink({ route: segments[0], id: segments[1] });
+      }
+  }
+}
+
+function handleConnectivity(data) {
+  bus.emit('connectivity:changed', data.online);
+}
+
+function handleTokenRefresh(data) {
+  if (data.token) {
+    store.set('auth.token', data.token);
+  }
+}
+
+function handleNavTap(data) {
+  const { world } = data;
+  if (world) scene.switchWorld(world);
+}