Add video player fork planning document

Created comprehensive plan for extracting video player into separate project:

Goals:
- Independent development of player features
- Tighter, more polished video controls
- Reusable component for other projects
- Keep VideoTools focused on video processing

Migration strategy:
1. Extract internal/player to new repo
2. Create clean API interface
3. Update VideoTools to use external package
4. Enhance controls in separate project

Future player improvements:
- Thumbnail preview on seek hover
- Frame-accurate stepping
- Playback speed controls
- Better keyboard shortcuts
- Timeline markers and more

This separation will allow both projects to evolve independently
while keeping the VideoTools codebase lean and focused.

docs/VIDEO_PLAYER_FORK.md

@@ -0,0 +1,106 @@
+# Video Player Fork Plan
+
+## Overview
+The video player component will be extracted into a separate project to allow independent development and improvement of video playback controls while keeping VideoTools focused on video processing.
+
+## Current Player Integration
+The player is currently embedded in VideoTools at:
+- `internal/player/` - Player implementation
+- `main.go` - Player state and controls in Convert module
+- Preview frame display
+- Playback controls (play/pause, seek, volume)
+
+## Fork Goals
+
+### 1. Independent Development
+- Develop player features without affecting VideoTools
+- Faster iteration on playback controls
+- Better testing of player-specific features
+- Can be used by other projects
+
+### 2. Improved Controls
+Current limitations to address:
+- Tighten up video controls
+- Better seek bar with thumbnails on hover
+- Improved timeline scrubbing
+- Keyboard shortcuts for playback
+- Frame-accurate stepping
+- Playback speed controls
+- Better volume control UI
+
+### 3. Clean API
+The forked player should expose a clean API:
+```go
+type Player interface {
+    Load(path string) error
+    Play()
+    Pause()
+    Seek(position time.Duration)
+    GetFrame(position time.Duration) (image.Image, error)
+    SetVolume(level float64)
+    Close()
+}
+```
+
+## Migration Strategy
+
+### Phase 1: Extract to Separate Module
+1. Create new repository: `github.com/yourusername/fyne-videoplayer`
+2. Copy `internal/player/` to new repo
+3. Extract player dependencies
+4. Create clean API surface
+5. Add comprehensive tests
+
+### Phase 2: Update VideoTools
+1. Import fyne-videoplayer as dependency
+2. Replace internal/player with external package
+3. Update player instantiation
+4. Verify all playback features work
+5. Remove old internal/player code
+
+### Phase 3: Enhance Player (Post-Fork)
+Features to add after fork:
+- [ ] Thumbnail preview on seek bar hover
+- [ ] Frame-accurate stepping (←/→ keys)
+- [ ] Playback speed controls (0.25x to 2x)
+- [ ] Improved volume slider
+- [ ] Keyboard shortcuts (Space, K, J, L, etc.)
+- [ ] Timeline markers
+- [ ] Subtitle support
+- [ ] Multi-audio track switching
+
+## Technical Considerations
+
+### Dependencies
+Current dependencies to maintain:
+- Fyne for UI rendering
+- FFmpeg for video decoding
+- CGO for FFmpeg bindings
+
+### Cross-Platform Support
+Player must work on:
+- Linux (GNOME, KDE, etc.)
+- macOS
+- Windows
+
+### Performance
+- Hardware acceleration where available
+- Efficient frame buffering
+- Low CPU usage during playback
+- Fast seeking
+
+## Timeline
+1. **Week 1-2**: Extract player code, create repo, clean API
+2. **Week 3**: Integration testing, update VideoTools
+3. **Week 4+**: Enhanced controls and features
+
+## Benefits
+- **VideoTools**: Leaner codebase, focus on processing
+- **Player**: Independent evolution, reusable component
+- **Users**: Better video controls, more reliable playback
+- **Developers**: Easier to contribute to either project
+
+## Notes
+- Keep player dependency minimal in VideoTools
+- Player should be optional - frame display can work without playback
+- Consider using player in Compare module for side-by-side playback (future)