v0.6.5 various bug fixes

frontend/src/contexts/SocketContext.jsx

@@ -21,7 +21,16 @@ export function SocketProvider({ children }) {
     }
 
     const token = localStorage.getItem('tc_token') || sessionStorage.getItem('tc_token');
-    const socket = io('/', { auth: { token }, transports: ['websocket'] });
+    const socket = io('/', {
+      auth: { token },
+      transports: ['websocket'],
+      // Aggressive reconnection so mobile resume is fast
+      reconnection: true,
+      reconnectionAttempts: Infinity,
+      reconnectionDelay: 500,
+      reconnectionDelayMax: 3000,
+      timeout: 8000,
+    });
     socketRef.current = socket;
 
     socket.on('connect', () => {
@@ -33,7 +42,21 @@ export function SocketProvider({ children }) {
     socket.on('user:online', ({ userId }) => setOnlineUsers(prev => new Set([...prev, userId])));
     socket.on('user:offline', ({ userId }) => setOnlineUsers(prev => { const s = new Set(prev); s.delete(userId); return s; }));
 
-    return () => { socket.disconnect(); socketRef.current = null; };
+    // Bug B fix: when app returns to foreground, force socket reconnect if disconnected
+    const handleVisibilityChange = () => {
+      if (document.visibilityState === 'visible') {
+        if (socketRef.current && !socketRef.current.connected) {
+          socketRef.current.connect();
+        }
+      }
+    };
+    document.addEventListener('visibilitychange', handleVisibilityChange);
+
+    return () => {
+      document.removeEventListener('visibilitychange', handleVisibilityChange);
+      socket.disconnect();
+      socketRef.current = null;
+    };
   }, [user?.id]);
 
   return (