TuneUp Version 28 accessibility changes

- Up/Down song playback announcements speak only the song title, without extension or position count.
- Number stations 2-0 announce only the station name before playback begins.
- Station 1 remains Main; Main is temporary and non-continuous.
- Saved station playlists continue automatically.
- Each saved station remembers its own Shuffle On/Off state.
- Ctrl+S searches the whole computer or opens a native Windows folder browser.
- Search results open in a native list with Add to <current station> and Finish buttons.
- After Add, focus returns to the same song in the search list.
- Escape from accessible menus announces Returning to <current station>.
- Main window title follows the active station so JAWS Insert+T reports TuneUp, <station> Station.
- Shuffle is presented as Off/On radio options; Space activates the focused option instead of Play/Pause.
- Arrange Stations items include Press Enter to select and begin with the station name so first-letter navigation works.

Cross-compiled successfully for Windows amd64. Full package test should be performed on Windows 11 with JAWS.
