darktable-inspired reskin + metadata/collections, map, easy mode, select/export

UI overhaul to a darktable tone-and-manner and a set of features adapted from
darktable's proven patterns (reimplemented in our Electron/TS stack; no GPL code).

Design reskin:
- Dark neutral-gray palette + amber accent, flat/squared corners, no card shadows,
  compact darktable-style top bar (logo + pipe-separated view tabs), denser 15px base
- Done via design tokens (Tailwind slate/brand/radius/shadow remap) — minimal churn

Metadata & collections (Phase A/B):
- exifr now captures GPS + camera; asset table ALTER-migrated (gpsLat/gpsLon/camera,
  metaVersion backfill on re-index)
- Collection facet bar (year timeline / camera / color-label) filters the grid

Map & relation finder (Phase C):
- Leaflet + online OSM map tab; geotagged photos as markers
- relationService: related photos by place (GPS<1km) + time (+/-2d) + CLIP similarity

Easy mode (Phase D):
- easyMode setting (menu / onboarding); scales the whole UI (rem) + bigger thumbnails
  + large icon nav with plain labels (4050 accessibility)

Library usability:
- Video thumbnails (representative frame capture in the inference worker)
- Media filter (All / Photos / Videos) to separate them
- Clearer culling labels ("Good shots" / "To cull") + explanation tooltip
- Multi-select tiles -> Export selected to a folder (copy, best-cut extraction) and
  Delete to Recycle Bin (shell.trashItem) behind a confirm dialog
- ONNX Runtime wasm bundled locally (offline) via copy-ort-wasm + asarUnpack

Docs: DARKTABLE_REVIEW (feasibility + roadmap A->D). All typecheck/tests/build green;
boot smoke verified each phase.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tailwind.config.mjs

@@ -5,10 +5,44 @@ export default {
   theme: {
     extend: {
       colors: {
+        // darktable 톤: 앰버(주황) 강조
         brand: {
-          DEFAULT: '#5b7cfa',
-          dark: '#3f5ad6'
+          DEFAULT: '#d98c3f',
+          dark: '#b9742e'
+        },
+        // 'slate' 스케일을 어두운 중성 회색 램프로 재정의 → 앱 크롬 전체 reskin
+        // (컴포넌트는 그대로 두고 토큰만 교체)
+        slate: {
+          50: '#f1f1f0',
+          100: '#e6e5e3',
+          200: '#d4d3d0',
+          300: '#aeadab',
+          400: '#8a8987',
+          500: '#6f6e6c',
+          600: '#454442',
+          700: '#2d2c2b',
+          800: '#232221',
+          900: '#1a1918'
         }
+      },
+      // darktable처럼 각진(거의 평평한) 모서리
+      borderRadius: {
+        none: '0',
+        sm: '2px',
+        DEFAULT: '2px',
+        md: '3px',
+        lg: '3px',
+        xl: '4px',
+        '2xl': '5px',
+        '3xl': '6px',
+        full: '9999px'
+      },
+      // 플랫한 그림자 (카드 느낌 제거)
+      boxShadow: {
+        sm: 'none',
+        DEFAULT: '0 1px 2px rgba(0,0,0,0.35)',
+        md: '0 2px 6px rgba(0,0,0,0.4)',
+        lg: '0 8px 24px rgba(0,0,0,0.5)'
       }
     }
   },