feat: emit message_received acknowledgment upon receipt of new messages

src/services/socket.service.ts

@@ -118,6 +118,15 @@ class SocketService {
     this.listenersAttached = true;
 
     this.socket.on('new_message', (message: Message) => {
+      // Auto-ack delivery so sender gets real-time double-tick
+      try {
+        this.socket?.emit('message_received', {
+          messageId: message.id,
+          conversationId: message.conversationId,
+        });
+      } catch {
+        // Ignore ack errors
+      }
       this.messageHandlers.forEach((handler) => handler(message));
     });