feat(map): replace Google Maps + OSMDroid with unified MapLibre Compose Multiplatform

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.

Author: jamesarich

app/build.gradle.kts

@@ -277,11 +277,6 @@ dependencies {
     debugImplementation(libs.androidx.compose.ui.test.manifest)
     debugImplementation(libs.androidx.glance.preview)
 
-    googleImplementation(libs.location.services)
-    googleImplementation(libs.play.services.maps)
-    googleImplementation(libs.maps.compose)
-    googleImplementation(libs.maps.compose.utils)
-    googleImplementation(libs.maps.compose.widgets)
     googleImplementation(libs.dd.sdk.android.compose)
     googleImplementation(libs.dd.sdk.android.logs)
     googleImplementation(libs.dd.sdk.android.rum)
@@ -294,10 +289,6 @@ dependencies {
     googleImplementation(libs.firebase.analytics)
     googleImplementation(libs.firebase.crashlytics)
 
-    fdroidImplementation(libs.osmdroid.android)
-    fdroidImplementation(libs.osmdroid.geopackage) { exclude(group = "com.j256.ormlite") }
-    fdroidImplementation(libs.osmbonuspack)
-
     testImplementation(kotlin("test-junit"))
     testImplementation(libs.androidx.work.testing)
     testImplementation(libs.koin.test)