fix(build): replace LatLngBounds properties with VisibleRegion corners

LatLngBounds.latSouth/latNorth/lonWest/lonEast don't exist in
MapLibre 13.0.1. Derive bounds from VisibleRegion corner LatLng
points (.nearLeft/.nearRight/.farLeft/.farRight) which are stable
across SDK versions.

Fixes CI compilation failure in MainActivity and ParticleWindView.

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

2 files changed, 16 insertions, 15 deletions

diff --git a/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt b/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt
index f84e5fb..ad5746d 100644
--- a/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt
+++ b/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt
@@ -327,11 +327,10 @@ class MainActivity : AppCompatActivity(), SafetyFragment.SafetyListener {
             }
 
             maplibreMap.addOnCameraIdleListener {
-                val bounds = maplibreMap.projection.visibleRegion.latLngBounds
-                viewModel.loadWindGrid(
-                    bounds.latSouth, bounds.latNorth,
-                    bounds.lonWest, bounds.lonEast
-                )
+                val r = maplibreMap.projection.visibleRegion
+                val lats = listOf(r.nearLeft.latitude, r.nearRight.latitude, r.farLeft.latitude, r.farRight.latitude)
+                val lons = listOf(r.nearLeft.longitude, r.nearRight.longitude, r.farLeft.longitude, r.farRight.longitude)
+                viewModel.loadWindGrid(lats.min(), lats.max(), lons.min(), lons.max())
             }
 
             maplibreMap.addOnMapLongClickListener { _ ->
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 0169fc1..d24d11c 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
@@ -73,11 +73,11 @@ class ParticleWindView @JvmOverloads constructor(
                  else ((now - lastFrameNs) / 1_000_000_000f).coerceAtMost(0.05f)
         lastFrameNs = now
 
-        val bounds = m.projection.visibleRegion.latLngBounds
-        val latSouth = bounds.latSouth.toFloat()
-        val latNorth = bounds.latNorth.toFloat()
-        val lonWest  = bounds.lonWest.toFloat()
-        val lonEast  = bounds.lonEast.toFloat()
+        val r = m.projection.visibleRegion
+        val latSouth = minOf(r.nearLeft.latitude, r.nearRight.latitude, r.farLeft.latitude, r.farRight.latitude).toFloat()
+        val latNorth = maxOf(r.nearLeft.latitude, r.nearRight.latitude, r.farLeft.latitude, r.farRight.latitude).toFloat()
+        val lonWest  = minOf(r.nearLeft.longitude, r.nearRight.longitude, r.farLeft.longitude, r.farRight.longitude).toFloat()
+        val lonEast  = maxOf(r.nearLeft.longitude, r.nearRight.longitude, r.farLeft.longitude, r.farRight.longitude).toFloat()
         val latRange = latNorth - latSouth
         val lonRange = lonEast  - lonWest
 
@@ -137,11 +137,13 @@ class ParticleWindView @JvmOverloads constructor(
     // ── Helpers ──────────────────────────────────────────────────────────────
 
     private fun scatter(m: MapLibreMap) {
-        val bounds = m.projection.visibleRegion.latLngBounds
-        val latSouth = bounds.latSouth.toFloat()
-        val lonWest  = bounds.lonWest.toFloat()
-        val latRange = (bounds.latNorth - latSouth).toFloat()
-        val lonRange = (bounds.lonEast  - lonWest).toFloat()
+        val r = m.projection.visibleRegion
+        val latSouth = minOf(r.nearLeft.latitude, r.nearRight.latitude, r.farLeft.latitude, r.farRight.latitude).toFloat()
+        val latNorth = maxOf(r.nearLeft.latitude, r.nearRight.latitude, r.farLeft.latitude, r.farRight.latitude).toFloat()
+        val lonWest  = minOf(r.nearLeft.longitude, r.nearRight.longitude, r.farLeft.longitude, r.farRight.longitude).toFloat()
+        val lonEast  = maxOf(r.nearLeft.longitude, r.nearRight.longitude, r.farLeft.longitude, r.farRight.longitude).toFloat()
+        val latRange = latNorth - latSouth
+        val lonRange = lonEast  - lonWest
         for (i in 0 until N) {
             particleLat[i] = latSouth + Random.nextFloat() * latRange
             particleLon[i] = lonWest  + Random.nextFloat() * lonRange