Harden Electron main: re-entrancy guard, tray destroy, loadURL error log

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

desktop-client/index.js

@@ -10,6 +10,7 @@ const YT_MUSIC_URL = 'https://music.youtube.com';
 let serverHandle = null;
 let mainWindow = null;
 let tray = null;
+let isQuitting = false;
 
 async function createWindow() {
   mainWindow = new BrowserWindow({
@@ -29,7 +30,11 @@ async function createWindow() {
     mainWindow = null;
   });
 
-  await mainWindow.loadURL(YT_MUSIC_URL);
+  try {
+    await mainWindow.loadURL(YT_MUSIC_URL);
+  } catch (err) {
+    console.error('[wtm] Failed to load YT Music:', err.message);
+  }
 }
 
 app.whenReady().then(async () => {
@@ -47,7 +52,6 @@ app.whenReady().then(async () => {
     onShow: () => {
       if (!mainWindow) return;
       if (mainWindow.isMinimized()) mainWindow.restore();
-      mainWindow.show();
       mainWindow.focus();
     },
     onQuit: () => app.quit(),
@@ -59,10 +63,12 @@ app.on('window-all-closed', () => {
 });
 
 app.on('before-quit', async (e) => {
-  if (serverHandle) {
-    e.preventDefault?.();
-    try { await serverHandle.stop(); } catch (_) {}
-    serverHandle = null;
-    app.exit(0);
-  }
+  if (isQuitting) return;
+  if (!serverHandle) return;
+  e.preventDefault();
+  isQuitting = true;
+  if (tray) { tray.destroy(); tray = null; }
+  try { await serverHandle.stop(); } catch (_) {}
+  serverHandle = null;
+  app.exit(0);
 });