Issues fixed:
- #87: Extend video session cookie to 24h and add keep-alive refresh every
30 minutes during playback to prevent expiration while watching long movies
- #88: Rank checklist completers by completion datetime (earliest first)
in both the 100% tab and main stats ranking as tiebreaker
- #89: Add confirmation modal when unchecking a movie from the checklist
to prevent accidental removal
Co-Authored-By: Claude Opus 4.5 <[email protected]>
