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/timeline.md

@@ -0,0 +1,13 @@
+# Project Timeline
+
+## 2026-06-01
+- Project Chronicle record folder initialized for PhotoAI.
+
+## 2026-06-02
+- Auto development record created: development\2026-06-02_e-wiki-photoai-이-프로젝트를-지금-개발-중이야-사진-관리-정리하는-기능성-유틸리티인데-사진-정리_implementation.md
+
+## 2026-06-02
+- Auto decision record created: decisions\ADR-0001-기업모드로-다시-너가-준-내용을-한번더-다같이-논의-하고-최종-결과물을-줄-수-있어.md
+
+## 2026-06-02
+- Auto development record created: development\2026-06-02_e-wiki-photoai-코딩-리뷰하고-설계적으로-더-최적화-할-수-있는-부분이-있는지-분석해줘_implementation.md