- Theme manager in settings: upload a .css file or paste CSS, template
download/copy/insert, edit and delete; custom themes show up in the
gallery and the quick switchers
- Themes are injected live as <style id="mindsift-custom-theme">; the
active one is cached so it applies on boot without flashing
- Backend: user_themes table and GET/POST /themes, DELETE /themes/{id}
(per user, max 200 KB)
- Docs: theming, REST, database
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
