debug(bounce): EVT_REG/BRIDGE_EVT_RX/WI_QUERY diag + fix PUSH_SENT typo

app/static/js/services/nativeBridgeService.js

@@ -54,6 +54,7 @@
       var self = this;
       try {
         window.__TAURI__.event.listen('bridge-audio', function (e) {
+          if (!self._evtDiagAt || Date.now() - self._evtDiagAt >= 1000) { self._evtDiagAt = Date.now(); if (window.__sfDiag) window.__sfDiag('BRIDGE_EVT_RX cb=' + (self._audioCb ? 'yes' : 'no') + ' len=' + (e.payload && e.payload.l ? e.payload.l.length : 0)); }
           // Bridge recovered after bridge-down (or never bootstrapped):
           // audio frames flow again -> re-establish routing (Fix C).
           if (!self.isBridgeConnected) self._reconnectIfNeeded();
@@ -71,6 +72,7 @@
           if (window.AudioRoutingEngine) window.AudioRoutingEngine.disconnect();
           console.warn('[BridgeService] bridge-down event received.');
         });
+        if (window.__sfDiag) window.__sfDiag('EVT_REG ok');
       } catch (e) {
         console.warn('[BridgeService] event listen failed:', e);
       }
@@ -136,7 +138,7 @@
         default:          byteCmd = cmd === 'NOTE_ON' ? 0x9 : 0x8; break;
       }
       this._pushSent = (this._pushSent || 0) + 1;
-      if (this.pushSent % 100 === 0 && window.__sfDiag) window.__sfDiag('PUSH_SENT ' + _pushSent);
+      if (this._pushSent % 100 === 0 && window.__sfDiag) window.__sfDiag('PUSH_SENT ' + this._pushSent);
       // DIAG: Promise.race 800ms — invoke gửi đi nhưng không settle -> timeout
       // (phan biet main-thread block vs Rust hang).
       Promise.race([