feat(ground-suite): add system glass themes

ground-suite/lib/app/app.dart

@@ -11,7 +11,9 @@ class GroundSuiteApp extends StatelessWidget {
     return MaterialApp(
       title: 'Ground Suite',
       debugShowCheckedModeBanner: false,
-      theme: groundSuiteTheme(),
+      theme: groundSuiteLightTheme(),
+      darkTheme: groundSuiteDarkTheme(),
+      themeMode: ThemeMode.system,
       home: const AppShell(),
     );
   }