결재 비활성 안내 개선 및 테이블 기능 보강

lib/features/approvals/history/presentation/controllers/approval_history_controller.dart

@@ -19,6 +19,7 @@ class ApprovalHistoryController extends ChangeNotifier {
   DateTime? _from;
   DateTime? _to;
   String? _errorMessage;
+  int _pageSize = 20;
 
   PaginatedResult<ApprovalHistoryRecord>? get result => _result;
   bool get isLoading => _isLoading;
@@ -27,6 +28,7 @@ class ApprovalHistoryController extends ChangeNotifier {
   DateTime? get from => _from;
   DateTime? get to => _to;
   String? get errorMessage => _errorMessage;
+  int get pageSize => _result?.pageSize ?? _pageSize;
 
   Future<void> fetch({int page = 1}) async {
     _isLoading = true;
@@ -42,13 +44,14 @@ class ApprovalHistoryController extends ChangeNotifier {
 
       final response = await _repository.list(
         page: page,
-        pageSize: _result?.pageSize ?? 20,
+        pageSize: _pageSize,
         query: _query.trim().isEmpty ? null : _query.trim(),
         action: action,
         from: _from,
         to: _to,
       );
       _result = response;
+      _pageSize = response.pageSize;
     } catch (e) {
       _errorMessage = e.toString();
     } finally {
@@ -86,6 +89,14 @@ class ApprovalHistoryController extends ChangeNotifier {
     notifyListeners();
   }
 
+  void updatePageSize(int value) {
+    if (value <= 0) {
+      return;
+    }
+    _pageSize = value;
+    notifyListeners();
+  }
+
   bool get hasActiveFilters =>
       _query.trim().isNotEmpty ||
       _actionFilter != ApprovalHistoryActionFilter.all ||