Add custom macOS-style title bar (#1404)

Introduces a custom MacOSTitleBar component for macOS, updates the Electron window to use 'hiddenInset' titleBarStyle, and adjusts App.vue to conditionally render the new title bar and add appropriate padding. This improves the native look and feel on macOS platforms.

src-electron/main.js

@@ -316,6 +316,7 @@ function createWindow() {
         height,
         icon: path.join(rootDir, 'VRCX.png'),
         autoHideMenuBar: true,
+        titleBarStyle: 'hiddenInset',
         webPreferences: {
             preload: path.join(__dirname, 'preload.js')
         }