Standalone FilesPage (plugged into the shell later): watched folders
(sidebar, chips with remove when narrow), a header saying where you are,
series sections and a 16:9 grid for loose videos, thumbnails requested
only for tiles that stay visible and cancelled when scrolled away,
hidden-files count with examples, rescan, Recent with missing-file
state, play errors in a banner, offline browsing with play disabled.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
