[feihongxu0824]

Summary

• render featured and article-card covers consistently without blank bands or per-post fit overrides
• normalize legacy cover assets and add dark-mode covers for the RaBitQ and multi-platform posts
• add a 16:9 cover specification plus automated validation for local paths, dimensions, and aspect ratio
• run the cover validator automatically during production builds

Validation

• npm run blog:covers:check
• npm run types:check
• npm run build

[github-actions]

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[zhourrr]

基于提交 8677648 做了代码检查、本地生产构建和浏览器验证。统一封面比例、补充暗色资源和接入构建检查的方向合理；现有 23 个封面资源校验、npm run types:check 和 npm run build 均通过。

下面提交 3 条行内意见，分别说明置顶封面的响应式裁切、YAML 行内注释导致的构建误报，以及必填封面的校验遗漏。每条都附了触发条件、复现结果和修改建议，建议先修复前两项，再合并。