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adef2fceb9
Adds Tools › Breadcrumb. Enter on the screen toggles tracking; while active, UITask::loop samples GPS at the cadence chosen in settings (default 1 min) and drops the point into a 256-entry RAM ring guarded by a min-distance gate (default 25 m). A "G" indicator joins "A" in the status bar with the same blink convention. New storage: - examples/companion_radio/Breadcrumb.h — BreadcrumbStore class - 256 × 12 B = 3 KB RAM (survives auto-off, lost on reboot — explicit flash-slot save comes in phase 4) - Haversine min-delta gate, total distance, elapsed seconds, current km/h, bounding-box helper New screen: - examples/companion_radio/ui-new/BreadcrumbScreen.h — Summary view with Status, Points, Dist (m or km), Time (h:mm), Speed; Enter toggles tracking, Esc returns to Tools Schema bump 0xC0DE0002 → 0xC0DE0003 for two new NodePrefs bytes: breadcrumb_interval_idx (1min default) and breadcrumb_min_delta_idx (25m default). Older saves leave both at zero, which matches the new defaults. DataStore::loadPrefsInt/savePrefs read/write the pair. Logging on/off is a runtime flag inside BreadcrumbStore — not a preference — so reboot returns to the off state cleanly; the user will be able to persist a snapshot to a slot in phase 4. Phase 2 (map view), 3 (point list), 4 (slot save/load, GPX export over USB), and 5 (settings UI) follow incrementally. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>