Update theme toggle functionality and UI components

Implemented a new ModeToggle feature for theme switching in personal account dropdown. The changes also made adjustments to several UI components, such as transforming Dialog to AlertDialog in transfer-ownership-dialog, and introducing invitation-submit-button in team-accounts. Some minor amendments include text changes and styling modifications.

apps/web/app/layout.tsx

@@ -40,7 +40,7 @@ function getClassName() {
   const theme = themeCookie ?? appConfig.theme;
   const dark = theme === 'dark';
 
-  return cn('antialiased', {
+  return cn('min-h-screen bg-background antialiased', {
     dark,
     [sans.className]: true,
   });