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/README.md

@@ -0,0 +1,18 @@
+# PhotoAI Chronicle Records
+
+## Project
+- ID: photoai
+- Root: E:\Wiki\PhotoAI
+- Record root: E:\Wiki\PhotoAI\docs\records\PhotoAI
+- Detail level: standard
+
+## Purpose
+Auto-created by Project Architecture activation.
+
+## Folders
+- `planning/`
+- `discussions/`
+- `decisions/`
+- `development/`
+- `bugs/`
+- `retrospectives/`