feat: Enhance admin panel navigation and UI by implementing tab management and improving layout structure

flutter/lib/features/admin/presentation/admin_screen.dart

@@ -1,50 +1,35 @@
 import 'package:flutter/material.dart';
-import 'package:flutter_riverpod/flutter_riverpod.dart';
-import '../../../core/l10n/l10n.dart';
 import 'admin_database_panel.dart';
 import 'admin_users_panel.dart';
 
-class AdminScreen extends ConsumerStatefulWidget {
-  const AdminScreen({super.key});
+enum AdminViewTab { users, database }
 
-  @override
-  ConsumerState<AdminScreen> createState() => _AdminScreenState();
+extension AdminViewTabX on AdminViewTab {
+  static AdminViewTab fromQuery(String? value) {
+    return switch (value) {
+      'database' => AdminViewTab.database,
+      _ => AdminViewTab.users,
+    };
+  }
+
+  String get queryValue => this == AdminViewTab.database ? 'database' : 'users';
 }
 
-class _AdminScreenState extends ConsumerState<AdminScreen> {
+class AdminScreen extends StatelessWidget {
+  final AdminViewTab initialTab;
+
+  const AdminScreen({super.key, this.initialTab = AdminViewTab.users});
+
   @override
   Widget build(BuildContext context) {
-    return DefaultTabController(
-      length: 2,
-      child: Column(
-        children: [
-          Material(
-            color: Theme.of(context).colorScheme.surface,
-            child: TabBar(
-              isScrollable: true,
-              padding: const EdgeInsets.symmetric(horizontal: 12),
-              tabs: [
-                Tab(text: context.l10n.profileUsersTab, icon: const Icon(Icons.people_outline)),
-                const Tab(text: 'Databas', icon: Icon(Icons.storage_outlined)),
-              ],
-            ),
-          ),
-          const Expanded(
-            child: TabBarView(
-              children: [
-                Padding(
-                  padding: EdgeInsets.fromLTRB(12, 8, 12, 8),
-                  child: AdminUsersPanel(embedded: true),
-                ),
-                Padding(
-                  padding: EdgeInsets.fromLTRB(12, 8, 12, 8),
-                  child: AdminDatabasePanel(embedded: true),
-                ),
-              ],
-            ),
-          ),
-        ],
-      ),
+    final activePanel = switch (initialTab) {
+      AdminViewTab.users => const AdminUsersPanel(embedded: true),
+      AdminViewTab.database => const AdminDatabasePanel(embedded: true),
+    };
+
+    return Padding(
+      padding: const EdgeInsets.fromLTRB(12, 8, 12, 8),
+      child: activePanel,
     );
   }
 }