好内容

- fix(ux): close add-article sheet immediately on submit, defer progress to library saving card
- refactor(sync): use CloudTestPresets.qiniuS3 from SDK
- feat(sync): add one-click qiniu test preset and automatic credential fallback
- feat(ui): display subtle sync loading text and spinner under home title
- feat(sync): add default qiniu credential auto-seed and verify e2e cloud sync
- feat(sync): implement multi-device cloud sync system with history screen and status bus
- fix(reader): 增加状态栏保护盖板，避免正文滚动时与系统状态栏图标文字重叠
- docs(intent): 回填 20261006-feature-reader-readwise-scroll-chrome-and-copy-toast commit hash
- feat(reader): Readwise 随动顶底栏 + 底部微进度线 + 居中复制提示 Toast (intent: 20261006-feature-reader-readwise-scroll-chrome-and-copy-toast)