feat: 补齐前端主流程并收紧工作台布局

统一工作台紧凑头部与形态图库间距，修复主体身份布局，并接入正式严格视频质量流水线。

tests/features/subject-images/asset-impact.test.ts

@@ -181,7 +181,7 @@ describe('过期首帧到具体素材定位', () => {
 
     it('切换镜头时筛选、关联说明和图片共用稳定纵向容器，长关联列表单独横向滚动', async () => {
         const { keyframes, videos, references, fetcher } = await gallery('?sourceShotId=shot-target')
-        expect(wrapper!.find('.workspace-heading-scroll').exists()).toBe(false)
+        expect(wrapper!.find('.workspace-heading-scroll').exists()).toBe(true)
         const scroll = wrapper!.get<HTMLElement>('.workspace-scroll > .n-scrollbar-container').element
         const content = wrapper!.get('.workspace-scroll-content').element
         const sticky = wrapper!.get('.gallery-sticky-controls').element