Add emitTyping method to chat store

src/stores/chat-store.ts

@@ -20,6 +20,7 @@ interface ChatState {
   openConversation: (friendId: string) => Promise<void>;
   loadMoreMessages: () => Promise<void>;
   sendMessage: (friendId: string, content: string) => void;
+  emitTyping: (friendId: string) => void;
   clearChat: () => void;
 }
 
@@ -140,6 +141,12 @@ export const useChatStore = create<ChatState>((set, get) => ({
     socket.emit('send-message', { recipientId: friendId, content });
   },
 
+  emitTyping: (friendId: string) => {
+    const { socket } = get();
+    if (!socket) return;
+    socket.emit('typing', { recipientId: friendId });
+  },
+
   clearChat: () => {
     set({
       messages: [],