refactor(content_management): replace DropdownButtonFormField with SearchableSelectionInput

- Replace DropdownButtonFormField with SearchableSelectionInput for content status selection
- Improve accessibility and usability of content status input field
- Update imports to include SearchableSelectionInput widget

Author: fulleni

lib/content_management/view/create_topic_page.dart

@@ -6,6 +6,7 @@ import 'package:flutter_news_app_web_dashboard_full_source_code/content_manageme
 import 'package:flutter_news_app_web_dashboard_full_source_code/content_management/bloc/create_topic/create_topic_bloc.dart';
 import 'package:flutter_news_app_web_dashboard_full_source_code/l10n/l10n.dart';
 import 'package:flutter_news_app_web_dashboard_full_source_code/shared/shared.dart';
+import 'package:flutter_news_app_web_dashboard_full_source_code/shared/widgets/searchable_selection_input.dart';
 import 'package:go_router/go_router.dart';
 import 'package:ui_kit/ui_kit.dart';
 
@@ -141,18 +142,12 @@ class _CreateTopicViewState extends State<_CreateTopicView> {
                       ),
                     ),
                     const SizedBox(height: AppSpacing.lg),
-                    DropdownButtonFormField<ContentStatus>(
-                      value: state.contentStatus,
-                      decoration: InputDecoration(
-                        labelText: l10n.status,
-                        border: const OutlineInputBorder(),
-                      ),
-                      items: ContentStatus.values.map((status) {
-                        return DropdownMenuItem(
-                          value: status,
-                          child: Text(status.l10n(context)),
-                        );
-                      }).toList(),
+                    SearchableSelectionInput<ContentStatus>(
+                      label: l10n.status,
+                      selectedItem: state.contentStatus,
+                      staticItems: ContentStatus.values.toList(),
+                      itemBuilder: (context, status) => Text(status.l10n(context)),
+                      itemToString: (status) => status.l10n(context),
                       onChanged: (value) {
                         if (value == null) return;
                         context.read<CreateTopicBloc>().add(