Document GNOME compatibility and window management limitations

Added comprehensive documentation on Linux/GNOME compatibility:

Known Issues:
- Double-click titlebar maximize is Fyne framework limitation
- Provided workarounds: Super+Up, maximize button, F11
- Window sizing issues have been fixed

Cross-platform goals:
- Smooth operation on Linux, macOS, Windows
- Single codebase with Fyne framework
- Respect native window manager behaviors

Testing matrix:
- GNOME/Fedora verified
- X11 and Wayland support
- Should work on KDE, XFCE, etc.

Development guidelines:
- Test on both X11 and Wayland
- Consider mouse and keyboard workflows
- Respect window manager tiling
- HiDPI display support

This documentation helps users understand current limitations
and provides context for cross-platform development priorities.

docs/GNOME_COMPATIBILITY.md

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+# GNOME/Linux Compatibility Notes
+
+## Current Status
+VideoTools is built with Fyne UI framework and runs on GNOME/Fedora and other Linux desktop environments.
+
+## Known Issues
+
+### Double-Click Titlebar to Maximize
+**Issue**: Double-clicking the titlebar doesn't maximize the window like native GNOME apps.
+
+**Cause**: This is a Fyne framework limitation. Fyne uses its own window rendering and doesn't fully implement all native window manager behaviors.
+
+**Workarounds for Users**:
+- Use GNOME's maximize button in titlebar
+- Use keyboard shortcuts: `Super+Up` (GNOME default)
+- Press `F11` for fullscreen (if app supports it)
+- Right-click titlebar → Maximize
+
+**Status**: Upstream Fyne issue. Monitor: https://github.com/fyne-io/fyne/issues
+
+### Window Sizing
+**Fixed**: Window now properly resizes and can be made smaller. Minimum sizes have been reduced to allow flexible layouts.
+
+## Desktop Environment Testing
+
+### Tested On
+- ✅ GNOME (Fedora 43)
+- ✅ X11 session
+- ✅ Wayland session
+
+### Should Work On (Untested)
+- KDE Plasma
+- XFCE
+- Cinnamon
+- MATE
+- Other Linux DEs
+
+## Cross-Platform Goals
+
+VideoTools aims to run smoothly on:
+- **Linux**: GNOME, KDE, XFCE, etc.
+- **macOS**: Native macOS window behavior
+- **Windows**: Native Windows window behavior
+
+## Fyne Framework Considerations
+
+### Advantages
+- Cross-platform by default
+- Single codebase for all OSes
+- Modern Go-based development
+- Good performance
+
+### Limitations
+- Some native behaviors may differ
+- Window management is abstracted
+- Custom titlebar rendering
+- Some OS-specific shortcuts may not work
+
+## Future Improvements
+
+### Short Term
+- [x] Flexible window sizing
+- [x] Better minimum size handling
+- [ ] Document all keyboard shortcuts
+- [ ] Test on more Linux DEs
+
+### Long Term
+- [ ] Consider native window decorations option
+- [ ] Investigate Fyne improvements for window management
+- [ ] Add more GNOME-like keyboard shortcuts
+- [ ] Better integration with system theme
+
+## Recommendations for Users
+
+### GNOME Users
+- Use Super key shortcuts for window management
+- Maximize: `Super+Up`
+- Snap left/right: `Super+Left/Right`
+- Fullscreen: `F11` (if supported)
+- Close: `Alt+F4` or `Ctrl+Q`
+
+### General Linux Users
+- Most window management shortcuts work via your window manager
+- VideoTools respects window manager tiling
+- Window can be resized freely
+- Multiple instances can run simultaneously
+
+## Development Notes
+
+When adding features:
+- Test on both X11 and Wayland
+- Verify window resizing behavior
+- Check keyboard shortcuts don't conflict
+- Consider both mouse and keyboard workflows
+- Test with HiDPI displays
+
+## Reporting Issues
+
+If you encounter GNOME/Linux specific issues:
+1. Note your distro and desktop environment
+2. Specify X11 or Wayland
+3. Include window manager if using tiling WM
+4. Provide steps to reproduce
+5. Check if issue exists on other platforms
+
+## Resources
+- Fyne Documentation: https://developer.fyne.io/
+- GNOME HIG: https://developer.gnome.org/hig/
+- Linux Desktop Testing: Multiple VMs recommended