Ensure asynchronous execution of window creation

Add `await` keyword to `createMainWindow` calls within app's 'ready' and 'activate' events to ensure the mainWindow is fully initialized before proceeding. This fix addresses potential race conditions where mainWindow could be used before being properly set up.

src/main/index.ts

@@ -12,12 +12,12 @@ app.on('ready', async () => {
   }
   macOSDisableDefaultMenuItem()
 
-  mainWindow = createMainWindow(mainWindow)
+  mainWindow = await createMainWindow(mainWindow)
 })
 
-app.on('activate', () => {
+app.on('activate', async () => {
   if (!mainWindow) {
-    mainWindow = createMainWindow(mainWindow)
+    mainWindow = await createMainWindow(mainWindow)
   }
 })