Introduces a dedicated conceptual walkthrough of device contacts, the
cache layer, the ignored/blocked flags, Settings → Contacts toggles,
recommended configuration, scenarios, recovery from the 350 limit,
auto-cleanup interaction, and FAQ/migration notes for users coming
from the official Android/iOS apps.
Also ships a standalone, responsive HTML version with embedded CSS
(light/dark auto) for sharing outside the repo, and links the guide
from user-guide.md.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
MarekWo