* Add direct filter shortcuts for Tree mode
- Add Ctrl+D for default filter
- Add Ctrl+T for no-tools filter (toggles with default)
- Add Ctrl+U for user-only filter (toggles with default)
- Add Ctrl+L for labeled-only filter (toggles with default)
- Add Ctrl+A for all filter (toggles with default)
- Keep existing Ctrl+O / Shift+Ctrl+O cycle shortcuts
- Update help text to show new shortcuts
* simplify tree selector shortcut line