fix: show gS icon in macOS Dock during dev mode

BrowserWindow icon is ignored on macOS — the Dock reads from the app bundle
.icns (set by electron-builder at package time). Added app.dock.setIcon()
call in dev mode so the gS monogram appears in the Dock during npm run dev.

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

Author: arunrajiah

src/main/index.ts

@@ -29,6 +29,11 @@ function createWindow(): void {
 
   mainWindow.on('ready-to-show', () => mainWindow!.show())
 
+  // Set Dock icon on macOS in dev mode (packaged builds use the .icns from electron-builder)
+  if (process.platform === 'darwin' && is.dev) {
+    app.dock?.setIcon(join(__dirname, '../../build/icon.png'))
+  }
+
   mainWindow.webContents.setWindowOpenHandler(({ url }) => {
     shell.openExternal(url)
     return { action: 'deny' }