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/singbox/generated/core.pbgrpc.dart

@@ -13,7 +13,7 @@ import 'dart:async' as $async;
 import 'dart:core' as $core;
 
 import 'package:grpc/service_api.dart' as $grpc;
-import 'package:hiddify/singbox/generated/core.pb.dart' as $0;
+import 'package:umbrix/singbox/generated/core.pb.dart' as $0;
 import 'package:protobuf/protobuf.dart' as $pb;
 
 export 'core.pb.dart';