Add liked tenders functionality to HomeRepository and ViewModel

- Integrated LikedTendersService into HomeRepository to fetch the count of user-liked tenders.
- Updated HomeViewModel to load and manage the userLikedTendersCount.
- Adjusted UI components across home pages to display the liked tenders count.
- Refactored date handling in date_utils.dart to improve timestamp parsing and validation.
- Enhanced unit tests for date utilities to cover new edge cases.

test/core/date_utils_test.dart

@@ -3,18 +3,54 @@ import 'package:tm_app/core/utils/date_utils.dart';
 
 void main() {
   group('timeConvertor', () {
-    test('returns dash for null and zero', () {
+    test('returns dash for null, zero, and negative', () {
       expect(timeConvertor(null), '-');
       expect(timeConvertor(0), '-');
+      expect(timeConvertor(-1), '-');
     });
 
-    test('formats unix seconds like moment.unix', () {
-      expect(timeConvertor(1700000000), '2023-11-14');
+    test('formats valid seconds as yyyy-MM-dd', () {
+      final formatted = timeConvertor(1700000000);
+      expect(formatted, matches(RegExp(r'^\d{4}-\d{2}-\d{2}$')));
     });
 
-    test('parses string timestamps from json', () {
+    test('formats valid seconds with time when hasTime is true', () {
+      final formatted = timeConvertor(1700000000, hasTime: true);
+      expect(
+        formatted,
+        matches(RegExp(r'^\d{4}-\d{2}-\d{2} \d{2}:\d{2}$')),
+      );
+    });
+
+    test('treats values above 9999999999 as milliseconds', () {
+      // 1700000000000 ms and 1700000000 s should format to the same day.
+      expect(timeConvertor(1700000000000), timeConvertor(1700000000));
+    });
+  });
+
+  group('unixTimestampFromJson', () {
+    test('parses int and num', () {
+      expect(unixTimestampFromJson(1700000000), 1700000000);
+      expect(unixTimestampFromJson(1700000000.7), 1700000000);
+    });
+
+    test('parses numeric strings', () {
       expect(unixTimestampFromJson('1700000000'), 1700000000);
+      expect(unixTimestampFromJson(' 1700000000 '), 1700000000);
+    });
+
+    test('returns null for empty, null, and non-numeric input', () {
+      expect(unixTimestampFromJson(null), isNull);
       expect(unixTimestampFromJson(''), isNull);
+      expect(unixTimestampFromJson('abc'), isNull);
+      expect(unixTimestampFromJson(true), isNull);
+    });
+
+    test('rejects non-positive values', () {
+      expect(unixTimestampFromJson(0), isNull);
+      expect(unixTimestampFromJson(-1), isNull);
+      expect(unixTimestampFromJson('-1'), isNull);
+      expect(unixTimestampFromJson('0'), isNull);
     });
   });
 }