feat(ui): wrap premium icon with tooltip for screen readers

- Add AppLocalizations import for localization support
- Rename getPremiumIcon method and add AppLocalizations parameter
- Wrap premium icon with Tooltip widget for accessibility
- Update tooltip message using localization

Author: fulleni

lib/shared/extensions/app_user_role_ui.dart

@@ -1,18 +1,20 @@
 import 'package:core/core.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_news_app_web_dashboard_full_source_code/l10n/app_localizations.dart';
 
 /// An extension on [AppUserRole] to provide UI-related helpers.
 extension AppUserRoleUI on AppUserRole {
   /// A convenience getter to check if the user role is premium.
   bool get isPremium => this == AppUserRole.premiumUser;
 
-  /// Returns a premium indicator icon if the user is a premium user.
+  /// Returns a premium indicator icon wrapped in a tooltip if the user is a
+  /// premium user.
   ///
   /// Returns a gold star icon for premium users, otherwise returns null.
-  Widget? get premiumIcon {
+  Widget? getPremiumIcon(AppLocalizations l10n) {
     if (isPremium) {
-      return const Padding(
-        padding: EdgeInsets.only(left: 8),
+      return Tooltip(
+        message: l10n.premiumUserTooltip,
         child: Icon(Icons.star, color: Colors.amber, size: 16),
       );
     }

lib/user_management/view/dashboard_user_role_ui.dart

@@ -1,4 +1,6 @@
 import 'package:core/core.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_news_app_web_dashboard_full_source_code/l10n/app_localizations.dart';
 
 /// An extension on [DashboardUserRole] to provide UI-related helpers.
 extension DashboardUserRoleUI on DashboardUserRole {
@@ -7,4 +9,30 @@ extension DashboardUserRoleUI on DashboardUserRole {
     return this == DashboardUserRole.admin ||
         this == DashboardUserRole.publisher;
   }
+
+  /// Returns a role indicator icon wrapped in a tooltip.
+  Widget? getRoleIcon(AppLocalizations l10n) {
+    switch (this) {
+      case DashboardUserRole.admin:
+        return Tooltip(
+          message: l10n.adminUserTooltip,
+          child: const Icon(
+            Icons.admin_panel_settings,
+            color: Colors.blueAccent,
+            size: 16,
+          ),
+        );
+      case DashboardUserRole.publisher:
+        return Tooltip(
+          message: l10n.publisherUserTooltip,
+          child: const Icon(
+            Icons.publish,
+            color: Colors.green,
+            size: 16,
+          ),
+        );
+      case DashboardUserRole.none:
+        return null;
+    }
+  }
 }