feat(vfd): showConn blink on WS connecting, showErr0 on VPS unreachable

Made-with: Cursor

lib/client.js

@@ -125,6 +125,7 @@ class ClawClient {
   _connect() {
     if (this._stopped) return;
 
+    if (this._wsFailCount < 3) led.display.showConn();
     log.info('clawd', `正在连接 ${this._cfg.server} ...`);
     const ws = new WebSocket(this._cfg.server, {
       handshakeTimeout: 10_000,
@@ -160,7 +161,7 @@ class ClawClient {
         log.warn('clawd', `连接断开 (${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
+            led.display.showErr0(); // 有网但 VPS 不可达
           } else {
             led.display.showAP();     // 无网，AP 模式
           }