feat(viewer,ui04): E02 static fidelity — real photo fixtures, measured shell/photo/collapse specs, edge fade

- fixtures: 8 picsum-seeded real photos (mixed ratios); seedPhoto thumbBytes/browseBytes injection
- e2e E02 block: wrapper shell (195x280/radius/border/#10161E), photo strip (193w, ratio-height, 3px gap), collapse (44/44 hit, 24 visual, sole button), desktop+mobile screenshots
- EmbedStream: top/bottom 12px dark fade (0.12, §2.3 optional item)
- fix(admin): pre-existing eslint globals gap for ElNotification (template drift, blocks lint gate)

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

apps/viewer/e2e/helpers.ts

@@ -151,6 +151,10 @@ export interface SeedPhotoOptions {
   width?: number;
   height?: number;
   publishedAt: Date;
+  /** UI-04：注入真实图片字节（如 e2e/fixtures 摄影样本）替代 sharp 色块；
+   * thumb/browse 各自可选，缺省仍按尺寸生成。bytes 与宽高须与元数据一致。 */
+  thumbBytes?: Buffer;
+  browseBytes?: Buffer;
 }
 
 /** 直种已发布照片：photos 行（ready/published，entityVersion=2 对齐发布事务）+
@@ -166,8 +170,8 @@ export async function seedPhoto(
   const thumbWidth = Math.max(1, Math.round(width / 2));
   const thumbHeight = Math.max(1, Math.round(height / 2));
   const [thumb, browse] = await Promise.all([
-    makeJpeg(thumbWidth, thumbHeight),
-    makeJpeg(width, height),
+    options.thumbBytes ?? makeJpeg(thumbWidth, thumbHeight),
+    options.browseBytes ?? makeJpeg(width, height),
   ]);
   await storage.put(variantKey(albumId, photoId, 'thumb'), thumb, 'image/jpeg');
   await storage.put(variantKey(albumId, photoId, 'browse'), browse, 'image/jpeg');