Add bulk photo selection panel to person page (admin)

On /people/:slug, admins see a sticky left panel and selectable photo
tiles. Clicking a tile (or its checkbox overlay) toggles selection;
clicking without modifier still opens the photo in a new tab. The panel
shows the selection count and two actions:

- Reassign to person: moves the selected photos' face entries from the
  current person's cluster to the chosen person.
- Move to album: moves the photo files on disk and updates album.json,
  faces.json, and people.json rel paths accordingly. Album paths are
  offered via a datalist autocomplete.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions