fix: Improve GitHub Actions workflows and add comprehensive tests

GitHub Actions improvements:
- Fix release workflow to prevent draft releases on new workflow runs
- Add automatic deletion of previous releases with same tag
- Improve test workflow with torrent-engine-downloads branch support
- Update Flutter version and add code generation step
- Add Android lint checks and debug APK builds
- Remove emoji from all workflow outputs for cleaner logs
- Add make_latest flag for proper release versioning

Test improvements:
- Add comprehensive unit tests for TorrentInfo model
- Add tests for FilePriority enum with comparison operators
- Add DownloadsProvider tests for utility methods
- Add widget tests for UI components and interactions
- Test video file detection and main file selection
- Test torrent state detection (downloading, paused, completed)
- Test byte formatting for file sizes and speeds

All tests validate the torrent downloads functionality
and ensure proper integration with Android engine.

test/providers/downloads_provider_test.dart

@@ -0,0 +1,40 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:neomovies_mobile/presentation/providers/downloads_provider.dart';
+
+void main() {
+  group('DownloadsProvider', () {
+    late DownloadsProvider provider;
+
+    setUp(() {
+      provider = DownloadsProvider();
+    });
+
+    tearDown(() {
+      provider.dispose();
+    });
+
+    test('initial state is correct', () {
+      expect(provider.torrents, isEmpty);
+      expect(provider.isLoading, isFalse);
+      expect(provider.error, isNull);
+    });
+
+    test('formatSpeed formats bytes correctly', () {
+      expect(provider.formatSpeed(1024), equals('1.0KB/s'));
+      expect(provider.formatSpeed(1048576), equals('1.0MB/s'));
+      expect(provider.formatSpeed(512), equals('512B/s'));
+      expect(provider.formatSpeed(2048000), equals('2.0MB/s'));
+    });
+
+    test('formatDuration formats duration correctly', () {
+      expect(provider.formatDuration(Duration(seconds: 30)), equals('30с'));
+      expect(provider.formatDuration(Duration(minutes: 2, seconds: 30)), equals('2м 30с'));
+      expect(provider.formatDuration(Duration(hours: 1, minutes: 30, seconds: 45)), equals('1ч 30м 45с'));
+      expect(provider.formatDuration(Duration(hours: 2)), equals('2ч 0м 0с'));
+    });
+
+    test('provider implements ChangeNotifier', () {
+      expect(provider, isA<ChangeNotifier>());
+    });
+  });
+}