ci: enforce flutter/biome format checks and fix front lint violations

userfront/lib/core/i18n/locale_gate.dart

@@ -34,16 +34,12 @@ class _LocaleGateState extends State<LocaleGate> {
   Future<void> _applyLocale() async {
     final normalized = normalizeLocaleCode(widget.localeCode);
     LocaleStorage.write(normalized);
-    webWindow.setTitle(
-      tr('ui.userfront.app_title'),
-    );
+    webWindow.setTitle(tr('ui.userfront.app_title'));
     if (context.locale.languageCode == normalized) {
       return;
     }
     await context.setLocale(Locale(normalized));
-    webWindow.setTitle(
-      tr('ui.userfront.app_title'),
-    );
+    webWindow.setTitle(tr('ui.userfront.app_title'));
   }
 
   @override

userfront/lib/core/i18n/locale_utils.dart

@@ -76,7 +76,7 @@ String buildLocalizedPath(String localeCode, Uri uri) {
     }
   }
   final newPath = '/${[localeCode, ...restSegments].join('/')}';
-  
+
   // Return only the path and query part to avoid GoRouter confusion with full URLs
   final newUri = uri.replace(path: newPath);
   String result = newUri.path;