Replace the dual flavor-specific map implementations (Google Maps for google,
OSMDroid for fdroid) with a single MapLibre Compose Multiplatform implementation
in feature:map/commonMain, eliminating ~8,500 lines of duplicated code.
Key changes:
- Add maplibre-compose v0.12.1 dependency (KMP: Android, Desktop, iOS)
- Create unified MapViewModel with camera persistence via MapCameraPrefs
- Create MapScreen, MaplibreMapContent, NodeTrackLayers, TracerouteLayers,
InlineMap, NodeTrackMap, TracerouteMap, NodeMapScreen in commonMain
- Create MapStyle enum with predefined OpenFreeMap tile styles
- Create GeoJsonConverters for Node/Waypoint/Position to GeoJSON
- Move TracerouteMapScreen from feature:node/androidMain to commonMain
- Wire navigation to use direct imports instead of CompositionLocal providers
- Delete 61 flavor-specific map files (google + fdroid source sets)
- Remove 8 CompositionLocal map providers from core:ui
- Remove SharedMapViewModel (replaced by new MapViewModel)
- Remove dead google-maps and osmdroid entries from version catalog
- Add MapViewModelTest with 10 test cases in commonTest
Baseline verified: spotlessCheck, detekt, assembleGoogleDebug, allTests all pass.
