Set no-referrer on message thumbnails and previews to prevent
QQ image requests from returning 400 and triggering ORB.
Add browser coverage for image loading and request headers.
Preserve focus when another control becomes active during the close animation.
Add regression tests for filter persistence, Escape, and custom range dialog focus.
- Load overview first and fetch secondary sections when expanded
- Add a covering index and select conversation IDs before loading page payloads
- Preserve full-detail API compatibility and add pagination and lazy-loading tests
BiFangKNT