Add video sorting, reference thumbnails, theme/i18n, menu, DnD/paste, presets

Feature work on top of the initial organizer:

- Videos: .mp4/.mov/.avi/.mkv/.webm/.m4v sorted into output/Movie/YYYY/MM
- Profiles: reference-image thumbnail cards via a secure photoai-media:// protocol
  (serves only registered reference images); per-thumbnail delete; add via
  click, drag & drop, or paste (Ctrl+V) using webUtils.getPathForFile + a
  byte-based addReferenceData path for clipboard images
- Presets: local person library (max 5) saved to userData; one-click apply into
  active profiles; reusing stored descriptors (no recompute)
- Theme: dark/light with dark default (Tailwind class strategy)
- i18n: ko/en table-based localization; first-run onboarding to pick
  language + theme; English-neutral "Unsorted" folder (was [미정])
- App menu: File/Edit/View/Window/Help, localized; Help opens a detailed,
  theme-aware user guide window
- UI: History block scrolls internally (no whole-window scroll);
  threshold/concurrency tooltips; generic example name
- Settings persisted to userData/settings.json; menu + renderer kept in sync
- Docs: NextGen Photo AI feasibility review + Phase 0/1 roadmap

All typecheck/tests (12) /build green; boot smoke verified.

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

tests/pathBuilder.test.ts

@@ -10,9 +10,14 @@ describe('buildTargetPath', () => {
     expect(p.replace(/\\/g, '/')).toBe('/out/seunghyun/2024/03/photo.jpg')
   })
 
-  it('미검출(who=null) 시 [미정] 폴더로 보낸다', () => {
+  it('미검출(who=null) 시 Unsorted 폴더로 보낸다', () => {
     const p = buildTargetPath('/out', null, date, '/src/photo.png')
-    expect(p.replace(/\\/g, '/')).toBe('/out/[미정]/2024/03/photo.png')
+    expect(p.replace(/\\/g, '/')).toBe('/out/Unsorted/2024/03/photo.png')
+  })
+
+  it('영상은 Movie/YYYY/MM 폴더로 보낸다', () => {
+    const p = buildTargetPath('/out', 'Movie', date, '/src/clip.mp4')
+    expect(p.replace(/\\/g, '/')).toBe('/out/Movie/2024/03/clip.mp4')
   })
 })
 

tests/scanner.test.ts

@@ -0,0 +1,24 @@
+import { describe, it, expect } from 'vitest'
+import { mediaKind } from '../src/main/scanner'
+
+describe('mediaKind', () => {
+  it('이미지 확장자를 image로 분류한다', () => {
+    expect(mediaKind('a.jpg')).toBe('image')
+    expect(mediaKind('a.JPEG')).toBe('image')
+    expect(mediaKind('a.png')).toBe('image')
+    expect(mediaKind('a.webp')).toBe('image')
+  })
+
+  it('영상 확장자를 video로 분류한다', () => {
+    expect(mediaKind('a.mp4')).toBe('video')
+    expect(mediaKind('a.MOV')).toBe('video')
+    expect(mediaKind('a.mkv')).toBe('video')
+    expect(mediaKind('a.m4v')).toBe('video')
+  })
+
+  it('지원하지 않는 확장자는 null', () => {
+    expect(mediaKind('a.txt')).toBeNull()
+    expect(mediaKind('a.heic')).toBeNull()
+    expect(mediaKind('noext')).toBeNull()
+  })
+})