The scan tool now behaves like music's, not just looks like it:
- Card matches: help '?' button, 'Last Scan' line, and the Movies/Shows/
Episodes/Size stats grid (populated from /api/video/dashboard on show + after
a scan). Same .tool-card-stats markup.
- Real progress bar: scanner fetches item totals up front (Plex section.
totalSize / Jellyfin TotalRecordCount) and reports a true percent as it
processes; the bar actually moves (movies → shows) instead of sitting at 100%.
- Cancel: the Scan button toggles to 'Cancel' mid-scan and POSTs
/api/video/scan/stop; the scanner checks a cancel flag between items and ends
in a 'cancelled' state. Mirrors music's stop affordance.
Tests: percent reported, cancel stops midway + saves only processed items, stop
route registered, tool-card structure. 117 video/integrity tests green.
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