Add filter dialog and bottom sheet for tenders

lib/view_models/your_tenders_view_model.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:intl/intl.dart';
 import 'package:tm_app/core/utils/result.dart';
 import 'package:tm_app/data/repositories/your_tenders_repository.dart';
 import 'package:tm_app/data/services/model/tender_approvals_response/tender_approvals_response.dart';
@@ -13,6 +14,17 @@ class YourTendersViewModel with ChangeNotifier {
   String? errorMessage;
   TenderApprovalsResponse? data;
 
+  // Filter States
+  DateTimeRange? selectedDateRange;
+  String selectedStatus = 'All';
+  final _fmt = DateFormat('yyyy/MM/dd');
+
+  String get startDateFormatted =>
+      selectedDateRange?.start != null ? _fmt.format(selectedDateRange!.start) : 'YYYY/MM/DD';
+
+  String get endDateFormatted =>
+      selectedDateRange?.end != null ? _fmt.format(selectedDateRange!.end) : 'YYYY/MM/DD';
+
   Future<void> getApprovedTenders() async {
     isLoading = true;
     notifyListeners();
@@ -32,4 +44,15 @@ class YourTendersViewModel with ChangeNotifier {
     isLoading = false;
     notifyListeners();
   }
+
+  // --- Filter Actions ---
+  void setDateRange(DateTimeRange? range) {
+    selectedDateRange = range;
+    notifyListeners();
+  }
+
+  void setStatus(String status) {
+    selectedStatus = status;
+    notifyListeners();
+  }
 }