feat(mobile): GPS playback dev tool#81
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Timer-driven 4 Hz engine with play/pause/seek/override and a broadcast UserLocation stream; freezed PlaybackState holds all simulation fields.
preview.time is milliseconds (matches home_eta_provider, route_sheet usage). Treating it as seconds made baseSpeed 1000x too small — at 10x multiplier, slider advanced ~1m in 30s on a 2.5km route.
Add SyntheticPuckOverlay (blue 22px circle) that projects the playback controller's current latlng to screen coordinates, and a ref.listen on PlaybackState that animates the camera to the synthetic position on each tick when in following mode. Gate myLocationEnabled and trackingCompass calls by playback state so the native GPS puck is hidden during playback.
# Conflicts: # mobile/lib/providers/navigation_provider.dart
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Summary
In-app GPS playback drawer for testing nav/TTS/reroute on real devices without riding. Replaces the location stream with a synthetic source the operator drives along the planned route.
Playback drawerswitch enables.animateCamera.myLocationEnableddisabled in playback mode so MapLibre's CL puck doesn't compete.Architecture:
mobile/lib/dev/{polyline_walker,playback_engine,playback_state,playback_controller,dev_mode,switchable_location_source}.dart+widgets/{playback_drawer,synthetic_puck_overlay}.dart.SwitchableLocationSourceswaps real GPS ↔ engine stream when toggle flips.Spec:
docs/superpowers/specs/2026-04-25-gps-playback-tool-design.md. Plan:docs/superpowers/plans/2026-04-25-gps-playback-tool.md.Test plan
flutter analyzeclean (very_good_analysis preset)flutter test221/221 pass