The Movies/TV selectors now save the moment you pick one — same as the music
'Music Library' selector right above them — instead of a separate 'Save
Libraries' button. Removed the button and the copied 'doesn't affect config
file' caption; a small inline status shows 'Saved'.
Right next to music's 'Music Library' selector, the video side now shows
'Movies Library' + 'TV Shows Library' dropdowns (data-video-only, hidden on the
music side). video-settings.js populates them from /api/video/libraries when
Settings opens on the video side and saves the choice back; the scanner then
reads only those libraries. Isolated IIFE, data-attr wired. 83 tests green.
