Tracks total distance (Haversine accumulation), elapsed time, current
speed, max speed, and altitude from live GPS fixes. Start/Stop button
pauses accumulation; Reset clears the trip. The current trip persists
across app restarts via wada.store.
Also adds 6 harness scenarios (no-fix, T-Deck, moving, persist, reset,
cost) and registers the app in apps.json.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
ALLFATHER-BV