feat: mobile-like window size and always-visible stats

- Changed window size to mobile phone format (400x800)
- Removed width condition for ActiveProxyFooter - now always visible
- Added run-umbrix.sh launch script with icon copying
- Stats cards now display on all screen sizes

lib/core/database/database_provider.dart

@@ -1,4 +1,4 @@
-import 'package:hiddify/core/database/app_database.dart';
+import 'package:umbrix/core/database/app_database.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 
 part 'database_provider.g.dart';