QA fixes: real listing creation, profile save, favorites, missing pages

- SellItemPage: real file upload + API listing creation + activate
- CreateProfilePage: save profile via PUT /users/profile
- ProductDetailPage: wire edit/delete/message buttons, show edit for owner
- ListingCard: persist favorites via API, show real images
- Footer: connect newsletter subscribe to API
- Router: add /dashboard/listings and /dashboard/saved routes
- Backend: add GET /listings/favorites endpoint
- New pages: MyListingsPage, SavedItemsPage
- Fix unused imports causing build failures

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

server/src/socket/index.ts

@@ -3,6 +3,9 @@ import { Server } from 'socket.io';
 import { verifyAccessToken } from '../utils/jwt.js';
 import { prisma } from '../config/database.js';
 
+// Online status tracking
+const onlineUsers = new Map<string, Set<string>>();
+
 export function setupSocket(httpServer: HTTPServer) {
   const io = new Server(httpServer, {
     cors: {
@@ -27,6 +30,15 @@ export function setupSocket(httpServer: HTTPServer) {
     const userId = socket.data.userId;
     socket.join(`user:${userId}`);
 
+    // Track online status
+    if (!onlineUsers.has(userId)) {
+      onlineUsers.set(userId, new Set());
+    }
+    onlineUsers.get(userId)!.add(socket.id);
+
+    // Broadcast online status
+    socket.broadcast.emit('user_online', { userId });
+
     socket.on('join_conversation', (conversationId: string) => {
       socket.join(`conversation:${conversationId}`);
     });
@@ -58,6 +70,19 @@ export function setupSocket(httpServer: HTTPServer) {
         if (conversation) {
           const recipientId = conversation.user1Id === userId ? conversation.user2Id : conversation.user1Id;
           io.to(`user:${recipientId}`).emit('message_notification', { conversationId: data.conversationId, message });
+
+          // Create notification
+          const sender = await prisma.user.findUnique({ where: { id: userId }, select: { fullName: true } });
+          const notification = await prisma.notification.create({
+            data: {
+              userId: recipientId,
+              type: 'NEW_MESSAGE',
+              title: 'New Message',
+              body: `${sender?.fullName || 'Someone'} sent you a message`,
+              data: { conversationId: data.conversationId },
+            },
+          });
+          io.to(`user:${recipientId}`).emit('new_notification', notification);
         }
       } catch (error) {
         socket.emit('error', { message: 'Failed to send message' });
@@ -79,8 +104,20 @@ export function setupSocket(httpServer: HTTPServer) {
       });
     });
 
+    socket.on('get_online_users', () => {
+      const users = Array.from(onlineUsers.keys());
+      socket.emit('online_users', users);
+    });
+
     socket.on('disconnect', () => {
-      // Cleanup handled by Socket.io
+      const userSockets = onlineUsers.get(userId);
+      if (userSockets) {
+        userSockets.delete(socket.id);
+        if (userSockets.size === 0) {
+          onlineUsers.delete(userId);
+          socket.broadcast.emit('user_offline', { userId });
+        }
+      }
     });
   });