chat: fix chat WebSocket URL (double /chat) — was disconnecting every chat

useChat connected to `/api/chat/chat/ws` while the server listens on `/api/chat/ws`.
The double `chat` was a de-Pi rename artifact: the global `api/pi/` → `api/chat/` sed
rewrote `/api/pi/chat/ws` to `/api/chat/chat/ws`, and the targeted fix ran too late to
catch it. Result: the chat socket never connected, so the UI showed "Disconnected" and
the model selector — locked while disconnected — displayed only the active (Claude)
provider, hiding OpenCode. One-character path fix restores all chat.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/workspaces/officerdev/src/hooks/useChat.ts

@@ -80,7 +80,7 @@ export function useChat(initialSessionId?: string, initialModel?: string | null,
 
   const token = localStorage.getItem('BEARER_TOKEN');
   const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
-  const wsUrl = `${protocol}//${window.location.host}/api/chat/chat/ws?token=${token}`;
+  const wsUrl = `${protocol}//${window.location.host}/api/chat/ws?token=${token}`;
 
   function flushStreaming() {
     if (rafRef.current !== null) cancelAnimationFrame(rafRef.current);