- Remove all shared state variables (unit, theme, GPS data, overlay status)
- Keep only local widget state (_errorMessage, _isInBackground, timer)
- Replace GPS initialization with context.read<GpsDataManager>().initialize()
- Replace overlay show/close/toggle with OverlayProvider methods
- Replace theme/unit cycling with SettingsProvider.cycleTheme/Unit()
- Remove isOverlayMode parameter (not used, overlay runs in separate isolate)
- Wrap build with Selector<SettingsProvider, ColorTheme> for scaffold background
- Use Selector<GpsDataManager, double> for speed display (rebuilds only on speed change)
- Use Selector<SettingsProvider, String> for unit label (rebuilds only on unit change)
- Use Selector<GpsDataManager, (heading, displayHeading)> for compass (rebuilds only on heading change)
- Use context.read<> for event handlers (non-rebuilding access)
- Simplify dispose() - only cancel background heartbeat timer and disable wakelock
- Background heartbeat uses OverlayProvider.pushCurrentData() instead of inline logic
- setState remains ONLY for _errorMessage (purely local error UI state)
- Remove unused imports (speed_unit.dart, processed_gps_data.dart)
- Portrait and landscape layouts both use Provider pattern
Mikkeli Matlock
7d111ca202