feat(library): photo + status badge + ManageImageSheet (Concept A)

Library was rendering one approval chip per device per photo PLUS one
lock chip per approved device. That's O(photos × devices) buttons —
fine at one or two frames, breaks at four+ (see
_bmad-output/.../library-many-frames-design-ideas.md).

Concept A from the design memo:
  - Each photo card stays a square thumb + a single "Manage" row.
  - Manage row summarises state: "3/5 frames · 🔒 Mom's Place".
  - A corner-lock badge sits on the thumb itself when any frame has the
    image locked, so the lock status is glanceable from the grid.
  - Tapping Manage opens the new ManageImageSheet bottom sheet, which
    lists every frame with an approve toggle + per-frame lock pill.
    Lock pill is disabled until the frame is approved.

Per-photo widgets drop from O(photos × devices) to O(photos). Works
identically at 1 or 50 frames. Curation principle stays "manage photos
TO the frame" — same store calls (imagesStore.setApproval,
devicesStore.lockImage/unlockImage), just routed through the sheet
instead of inline chip rows.

10 new ManageImageSheet unit tests + LibraryView tests rewritten to
cover the sheet-open + event-forwarding flow. 358/358 frontend tests.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

public/build/index.html

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