PWA auto-opens last room + visible ping notifications

1. Installed PWA (standalone mode) auto-redirects to last visited room
   on launch instead of showing the landing page. Uses localStorage
   rmaps_last_room + display-mode: standalone media query.

2. Manual pings now show visible feedback in three ways:
   - In-app toast: green banner "Alice pinged you for your location!"
   - Browser notification: fires Notification API when permission granted
   - Vibration: unchanged [200, 100, 200, 100, 400] pattern

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/[slug]/page.tsx

@@ -48,6 +48,7 @@ export default function RoomPage() {
   const [zoomToLocation, setZoomToLocation] = useState<{ latitude: number; longitude: number } | null>(null);
   const [needsJoin, setNeedsJoin] = useState(false);
   const [pendingManualPing, setPendingManualPing] = useState(false);
+  const [pingToast, setPingToast] = useState<string | null>(null);
 
   // Check if opened from a manual ping notification (e.g. ?ping=manual&pinger=Alice)
   const [pingCallerName, setPingCallerName] = useState<string | undefined>(undefined);
@@ -154,7 +155,27 @@ export default function RoomPage() {
 
   // Handle manual ping: vibrate device + one-shot GPS regardless of sharing state
   const handleManualPing = useCallback((callerName?: string) => {
-    console.log(`Manual ping from ${callerName || 'unknown'} — vibrating and sending GPS`);
+    const pinger = callerName || 'Someone';
+    console.log(`Manual ping from ${pinger} — vibrating and sending GPS`);
+
+    // Show in-app toast
+    setPingToast(`📍 ${pinger} pinged you for your location!`);
+    setTimeout(() => setPingToast(null), 4000);
+
+    // Show browser notification (works even when tab is backgrounded)
+    if (typeof Notification !== 'undefined' && Notification.permission === 'granted') {
+      try {
+        new Notification(`📍 ${pinger} pinged you!`, {
+          body: 'Sharing your location now...',
+          icon: '/icon-192.png',
+          tag: 'manual-ping',
+          silent: true, // vibration handles the alert
+        });
+      } catch {
+        // Ignore notification errors (e.g. in standalone PWA)
+      }
+    }
+
     if (typeof navigator !== 'undefined' && 'vibrate' in navigator) {
       navigator.vibrate([200, 100, 200, 100, 400]);
     }
@@ -496,6 +517,13 @@ export default function RoomPage() {
           </div>
         )}
 
+        {/* Ping toast notification */}
+        {pingToast && (
+          <div className="absolute top-4 left-1/2 -translate-x-1/2 bg-emerald-500/90 text-white text-sm px-4 py-2 rounded-full z-30 shadow-lg animate-pulse">
+            {pingToast}
+          </div>
+        )}
+
         {/* Connection status indicator */}
         {!isConnected && (
           <div className="absolute top-4 left-1/2 -translate-x-1/2 bg-yellow-500/90 text-black text-sm px-3 py-1.5 rounded-full z-30">

src/app/page.tsx

@@ -27,6 +27,7 @@ export default function HomePage() {
   const [lastRoom, setLastRoom] = useState<string | null>(null);
 
   // Load saved user info from localStorage on mount
+  // If opened as installed PWA (standalone mode), auto-redirect to last room
   useEffect(() => {
     let loadedEmoji = '';
     try {
@@ -43,6 +44,14 @@ export default function HomePage() {
       const lastVisited = localStorage.getItem('rmaps_last_room');
       if (lastVisited) {
         setLastRoom(lastVisited);
+
+        // Auto-redirect if running as installed PWA and user has saved info
+        const isStandalone = window.matchMedia('(display-mode: standalone)').matches
+          || (navigator as unknown as { standalone?: boolean }).standalone === true;
+        if (isStandalone && stored) {
+          router.push(`/${lastVisited}`);
+          return;
+        }
       }
     } catch {
       // Ignore parse errors
@@ -52,7 +61,7 @@ export default function HomePage() {
       setEmoji(EMOJI_OPTIONS[Math.floor(Math.random() * EMOJI_OPTIONS.length)]);
     }
     setIsLoaded(true);
-  }, []);
+  }, [router]);
 
   // Auto-fill name from EncryptID when authenticated
   useEffect(() => {