ClearChat Home v1.5.0 RC1

This is a release-candidate polish build for the Home edition. It focuses on final UI consistency, Settings Center usability, Hybrid theme polish, mobile admin spacing, update/version clarity, and sidebar cleanup.

Recommended testing:
1. Settings Center sections open/close cleanly.
2. Widget color saves and changes public widget.
3. Light/Dark/Hybrid/System themes switch correctly.
4. Update page displays version 1.5.0-rc1-home after patch.
5. Admin pages remain usable on phone/tablet widths.
