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

.gitignore

@@ -60,3 +60,4 @@ app.*.map.json
 
 # FVM Version Cache
 .fvm/lib/core/telegram_config.dart
+android/key.properties