修复画板私有素材预览

让生成参考图和角色动作参考图通过 objectKey 换签显示

让视频图层 poster 与框选预览复用签名读取

补充参考槽、框选预览和视频图层回归测试

沉淀框选预览换签缓存踩坑

src/components/image-editor/ImageCanvasWorldView.test.tsx

@@ -962,6 +962,8 @@ describe('ImageCanvasWorldView', () => {
       resolvedUrl:
         source === '/generated-character-drafts/editor-videos/video-7.mp4'
           ? 'https://oss.example.com/video-7.mp4?signature=1'
+          : source === '/generated-character-drafts/editor/video-7-poster.png'
+            ? 'https://oss.example.com/video-7-poster.png?signature=1'
           : source,
       isResolving: false,
       shouldResolve: true,
@@ -971,6 +973,7 @@ describe('ImageCanvasWorldView', () => {
       src: '/generated-character-drafts/editor-videos/video-7.mp4',
       mediaType: 'video',
       assetKind: 'video',
+      thumbnailSrc: '/generated-character-drafts/editor/video-7-poster.png',
       width: 854,
       height: 480,
       originalWidth: 854,
@@ -988,6 +991,9 @@ describe('ImageCanvasWorldView', () => {
     expect(video.getAttribute('src')).toBe(
       'https://oss.example.com/video-7.mp4?signature=1',
     );
+    expect(video.getAttribute('poster')).toBe(
+      'https://oss.example.com/video-7-poster.png?signature=1',
+    );
     expect(video.hasAttribute('controls')).toBe(true);
     expect(video.hasAttribute('playsinline')).toBe(true);
     expect(video.getAttribute('preload')).toBe('metadata');