feat(v1.2.5): 优化首页滚动顺滑性、恢复整屏吸附并提升 Halo 要求至 2.27

- 首页固定模糊半径只改 opacity；Hero 离屏停绘；Navbar 滚动状态去重
- 恢复首屏整屏吸附：仅接管 0 ↔ 内容区顶部边界，scrollend + 600ms 兜底解锁
- CSS scroll-snap proximity 实际不吸附（缺页面顶部吸附点），已移除避免与 scrollTo 冲突
- 版本 1.2.5，requires >=2.27.0；源码仓库与问题反馈改为 git.nxxy335.top
- 更新 README / FAQ / 开发指南 / 更新日志，补充性能与发版说明

compat/assets/index@_@astro.CDhydtRA.css

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