feat(web): wire WebSocket chat with streaming and conversation switching (#120) (#136)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/web/src/lib/socket.ts

@@ -9,7 +9,24 @@ export function getSocket(): Socket {
     socket = io(`${GATEWAY_URL}/chat`, {
       withCredentials: true,
       autoConnect: false,
+      transports: ['websocket', 'polling'],
+    });
+
+    // Reset singleton reference when socket is fully closed so the next
+    // getSocket() call creates a fresh instance instead of returning a
+    // closed/dead socket.
+    socket.on('disconnect', () => {
+      socket = null;
     });
   }
   return socket;
 }
+
+/** Tear down the singleton socket and reset the reference. */
+export function destroySocket(): void {
+  if (socket) {
+    socket.offAny();
+    socket.disconnect();
+    socket = null;
+  }
+}