NEW: copilot instructions added

.github/copilot-instructions.md

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+# Copilot Instructions for splash_video
+
+## Project Overview
+A Flutter package for video splash screens using `media_kit`. Provides smooth transitions from native splash to video playback with overlay support and manual controls.
+
+## Architecture
+
+### Core Components
+- **`SplashVideo`** ([lib/widgets/splash_video_w.dart](../lib/widgets/splash_video_w.dart)) - Main widget orchestrating lifecycle, overlays, and navigation
+- **`SplashVideoPlayer`** ([lib/widgets/splash_video_player_w.dart](../lib/widgets/splash_video_player_w.dart)) - Internal widget handling media_kit Player/VideoController
+- **`SplashVideoController`** ([lib/splash_video_controller.dart](../lib/splash_video_controller.dart)) - Public API for play/pause/skip with underlying Player access
+- **`VideoConfig`** ([lib/video_config.dart](../lib/video_config.dart)) - Configuration: fitMode, volume, playImmediately, useSafeArea
+- **`Source`** (sealed class in [lib/video_source.dart](../lib/video_source.dart)) - Video sources: `AssetSource`, `NetworkSource`, `DeviceFileSource`, `BytesSource`
+
+### Key Pattern: Deferred First Frame
+The package uses Flutter's `deferFirstFrame`/`allowFirstFrame` to prevent jank:
+```dart
+// In main() - call SplashVideo.initialize() ONLY if first screen is SplashVideo
+SplashVideo.initialize();  // Defers frame + initializes MediaKit
+// Later, SplashVideo.resume() is called automatically when video loads
+```
+
+### Widget Composition
+```
+SplashVideo (lifecycle, navigation, overlays)
+  └── SplashVideoPlayer (media_kit integration)
+        └── Video widget from media_kit_video
+```
+
+## Development Commands
+
+```bash
+# Run all unit tests
+flutter test
+
+# Run specific test
+flutter test test/video_source_test.dart
+
+# Run with coverage
+flutter test --coverage
+
+# Integration tests (from example/)
+cd example && flutter test integration_test/plugin_integration_test.dart
+
+# Run example app
+cd example && flutter run
+```
+
+## Conventions
+
+### Source Types (Sealed Class)
+Always use the appropriate `Source` subclass - the sealed class prevents external subclassing:
+```dart
+AssetSource('assets/videos/splash.mp4')      // Bundled assets
+NetworkSource('https://example.com/video.mp4') // URLs (validates format)
+DeviceFileSource('/path/to/video.mp4')       // Local files
+BytesSource(Uint8List)                        // In-memory bytes
+```
+
+### VideoFitMode
+Maps to Flutter's `BoxFit`. Default is `cover` for splash screens (fills screen, may crop).
+
+### Controller Lifecycle
+- Controller must be disposed by the caller (not the widget)
+- Access `controller.player` only after widget is built (throws `StateError` otherwise)
+- For looping videos, controller is **required**
+
+### Error Handling
+- Use `SplashVideoException` for package-specific errors
+- Provide `onVideoError` callback for graceful degradation
+- In debug mode, diagnostic prints prefixed with `SplashVideoPlayer:` or `SplashVideo:`
+
+## Testing Patterns
+
+Tests use Arrange-Act-Assert pattern. Widget tests should handle async initialization:
+```dart
+group('FeatureName', () {
+  test('should do something', () {
+    // Arrange - setup
+    // Act - execute
+    // Assert - verify with expect()
+  });
+});
+```
+
+See [test/README.md](../test/README.md) for comprehensive testing guide.
+
+## File Structure
+```
+lib/
+├── splash_video.dart          # Library exports (barrel file)
+├── splash_video_controller.dart
+├── splash_video_enums.dart    # VideoFitMode + BoxFit extension
+├── video_config.dart
+├── video_source.dart          # Sealed Source class hierarchy
+├── utils.dart                 # Typedefs, exceptions, extensions
+└── widgets/
+    ├── splash_video_w.dart    # Main public widget
+    └── splash_video_player_w.dart  # Internal player widget
+```
+
+## Platform Support
+All platforms via media_kit: Android, iOS, macOS, Windows, Linux. Platform-specific libs are in pubspec.yaml dependencies.
+
+## Workflow Rules
+- **Documentation format**: Create all documentation with lowercase filenames and `.rst` format, no emojis
+- **End of task**: Always ask if tests and documentation should be updated (README.md is critical)
+- **No auto-docs**: Do not create a document for every feature/change - ask if comprehensive documentation is wanted at task end
+- **No silent removal**: Never remove functionality without explicit user confirmation