fix(workspace): add http polling fallback for proxy/firewall environments and exponential ws reconnect backoff

frontend/src/lib/api.ts

@@ -1048,6 +1048,7 @@ let wsListeners: ((msg: WSMessage) => void)[] = [];
 let wsStatusListeners: ((connected: boolean) => void)[] = [];
 let isWSConnected = false;
 let manualDisconnect = false;
+let wsReconnectDelay = 2000;
 
 export function buildWebSocketURL(listId?: string): string {
   const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
@@ -1097,6 +1098,7 @@ export function connectWebSocket(): void {
     activeGlobalWS = ws;
 
     ws.onopen = () => {
+      wsReconnectDelay = 2000;
       notifyStatusChange(true);
     };
 
@@ -1121,9 +1123,11 @@ export function connectWebSocket(): void {
       notifyStatusChange(false);
       if (!manualDisconnect && getToken()) {
         clearTimeout(wsReconnectTimer);
+        const delay = wsReconnectDelay;
+        wsReconnectDelay = Math.min(30000, Math.round(wsReconnectDelay * 1.5));
         wsReconnectTimer = setTimeout(() => {
           connectWebSocket();
-        }, 3000);
+        }, delay);
       }
     };