feat(led): showErr(code) + WS fail>=3 shows ERRa or AP on VFD

Made-with: Cursor

lib/client.js

@@ -39,6 +39,9 @@ class ClawClient {
     this._pingTimer       = null;
     this._awaitingPong    = false;
 
+    // WS 连续失败计数（open 时清零）
+    this._wsFailCount = 0;
+
     // systemd watchdog
     this._sdTimer = null;
 
@@ -131,6 +134,7 @@ class ClawClient {
     ws.on('open', () => {
       log.info('clawd', 'WebSocket 已连接');
       this._backoff = 1_000;
+      this._wsFailCount = 0; // 连接成功，重置失败计数
       this._sendConnect();
       this._startPing();
       // 显示由 _onConnected 根据 status 设置，不在此处提前 showTime
@@ -152,7 +156,15 @@ class ClawClient {
       this._clearHeartbeat();
       this._clearPing();
       if (!this._stopped) {
-        log.warn('clawd', `连接断开 (${code})，${this._backoff / 1000}s 后重连...`);
+        this._wsFailCount++;
+        log.warn('clawd', `连接断开 (${code})，失败次数=${this._wsFailCount}，${this._backoff / 1000}s 后重连...`);
+        if (this._wsFailCount >= 3) {
+          if (hasInternet()) {
+            led.display.showErr('a'); // 有网但 VPS 不可达
+          } else {
+            led.display.showAP();     // 无网，AP 模式
+          }
+        }
         setTimeout(() => this._connect(), this._backoff);
         this._backoff = Math.min(this._backoff * 2, MAX_BACKOFF_MS);
       }