Library workspace upgrades: darkroom viewer, mosaic, geotagging, file explorer

- darkroom-style fullscreen viewer: left info panel, rating/color-label toolbar,
  bottom filmstrip, keyboard nav (Esc / arrows), placeholder on load failure
- thumbnail density slider (contact-sheet) + photo mosaic generator (target -> tiles)
- lighttable-style hover info preview (no click needed)
- map drag & drop geotagging (saved to index only; originals untouched)
- file explorer: parallel drive scan + timeout, create/delete(trash)/move folders;
  index reparent on move and cleanup on delete (single source of truth)
- library: photos-before-videos ordering; drag range select/deselect;
  native image drag disabled so sweep-select works
- responsive sidebar font scaling; no-wrap filter labels; media protocol CORS + video Range

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/records/PhotoAI/chronicle.config.json

@@ -0,0 +1,11 @@
+{
+  "projectId": "photoai",
+  "projectName": "PhotoAI",
+  "projectRoot": "E:\\Wiki\\PhotoAI",
+  "recordRoot": "E:\\Wiki\\PhotoAI\\docs\\records\\PhotoAI",
+  "description": "Auto-created by Project Architecture activation.",
+  "corePurpose": "",
+  "detailLevel": "standard",
+  "createdAt": "2026-06-01T04:16:09.722Z",
+  "updatedAt": "2026-06-02T05:39:25.175Z"
+}