Add full-text photo library, bulk select/download, duplicate detection, video support, and zero-config folder detection

- Search & Edit becomes a multi-view library: Tagged/Untagged/Failed/Videos/Duplicates
- Bulk select (click, shift-click range, select-all-matching) with bulk recategorize,
  CSV/JSON export, and original-quality ZIP download (verified byte-identical)
- Video browsing/tagging via ffmpeg frame extraction, native playback with range support
- Duplicate detection via a lightweight perceptual-hash index (no new dependencies)
- Full-resolution photo/video viewer with editable metadata, prev/next navigation
- Date range, file-type, and category quick-filters; saved searches (localStorage)
- Appearance settings: accent color picker, grid density, results-per-page; full dark mode
- Auto-detects its photo folder (CLI arg > env var > last used > parent directory),
  so the app can be dropped into any photo collection and just work

.gitignore

@@ -1,3 +1,9 @@
 __pycache__/
 *.pyc
 photon_journal.jsonl
+photon_failures.jsonl
+photon_audits.jsonl
+photon_phash.json
+photon_folder.json
+photon_categories.json
+.claude/