feat(v3): 配色体系对齐 deepseek-harness Web（D7 视觉）

- 提取 dsh design-platform 官方色板为设计令牌：品牌蓝 #4176e6、bluish 灰阶、
  语义状态色、透明描边（rgba 0.04-0.1）
- 侧栏改近白（sidebar-fill），扁平化阴影，悬停/滚动条/缓动全部对齐 dsh
- 六视图旧硬编码蓝批量令牌化，视觉单一来源

gateway/static/assets/ReviewView-9PXrv1jO.css

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