fix: auto-logout on WS auth.error (forces re-login with valid JWT)

src/lib/ws.ts

@@ -51,6 +51,14 @@ class WSClient {
           this.pendingQueue = [];
         }
 
+        // Auth error → force re-login
+        if (type === "auth.error") {
+          console.error("WS auth failed:", msg);
+          localStorage.removeItem("tb_token");
+          window.location.href = "/login";
+          return;
+        }
+
         // Dispatch to handlers
         const fns = this.handlers.get(type);
         if (fns) fns.forEach((fn) => fn(msg.data || msg));