- toggle_telegram_push: reset cursor to NOW when transitioning 0→1
(idempotent when already enabled, prevents historical email flood)
- Add '🔔 推送' tag to account cards when push is enabled
- Tag is clickable to disable push (removes tag)
- Add .tg-push-tag CSS (Telegram blue #0088cc)
- Add test T-12b: verify re-enable resets cursor
- Update BUG-00007 doc with BUG-TG-005
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>