ClearChat Home v1.5.2 RC3

Final RC cleanup patch:
- Keeps admin/sidebar/content width consistent when switching between Light, Dark, Hybrid, and System themes.
- Removes the empty Appearance/visibility-style section from Settings Center.
- Improves updater behavior for future patches by redirecting after a successful update so the browser reloads the newly installed version automatically.
- Bumps version display to 1.5.2-rc3-home.

Protected files are still not overwritten by the updater.
