Drop Notification API (only fires when tab open). Instead render two
wa.me deep-link buttons that pre-fill reminder text to the user's own
WhatsApp number (77477854246). Steps button auto-picks 5k (weekday)
or 10k (weekend) based on current day.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>