Default map to charts; fix synchronized particle flash on pan/zoom

- MapLayerManager: default base preset changed from SATELLITE to CHARTS
- ParticleWindView: respawned particles now get a random age (0..MAX_AGE)
  instead of always 0, preventing mass synchronized respawns after pan/zoom

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

2 files changed, 2 insertions, 2 deletions

diff --git a/android-app/app/src/main/kotlin/org/terst/nav/ui/MapLayerManager.kt b/android-app/app/src/main/kotlin/org/terst/nav/ui/MapLayerManager.kt
index cf78ec2..8892285 100644
--- a/android-app/app/src/main/kotlin/org/terst/nav/ui/MapLayerManager.kt
+++ b/android-app/app/src/main/kotlin/org/terst/nav/ui/MapLayerManager.kt
@@ -128,5 +128,5 @@ class MapLayerManager(context: Context) {
     private fun loadBasePreset(): MapBasePreset =
         prefs.getString(KEY_BASE, null)?.let {
             runCatching { MapBasePreset.valueOf(it) }.getOrNull()
-        } ?: MapBasePreset.SATELLITE
+        } ?: MapBasePreset.CHARTS
 }
diff --git a/android-app/app/src/main/kotlin/org/terst/nav/ui/map/ParticleWindView.kt b/android-app/app/src/main/kotlin/org/terst/nav/ui/map/ParticleWindView.kt
index f8122d9..61c34ad 100644
--- a/android-app/app/src/main/kotlin/org/terst/nav/ui/map/ParticleWindView.kt
+++ b/android-app/app/src/main/kotlin/org/terst/nav/ui/map/ParticleWindView.kt
@@ -111,7 +111,7 @@ class ParticleWindView @JvmOverloads constructor(
             if (needsRespawn) {
                 particleLat[i] = latSouth + Random.nextFloat() * latRange
                 particleLon[i] = lonWest  + Random.nextFloat() * lonRange
-                particleAge[i] = 0f
+                particleAge[i] = Random.nextFloat() * MAX_AGE
                 continue
             }