fix(android): clean up polyline animator on view drop (#72)

Notify GoogleMapProvider from LuggPolylineView.onDropViewInstance so the
PolylineAnimator (and its infinite-repeat ValueAnimator) gets cancelled
even when the view is dropped without going through removeViewAt. Also
guards addPolylineViewToMap against an already-registered animator entry
and drops a per-frame ArrayList copy in updateAnimatedPolyline.

Author: lodev09

android/src/main/java/com/luggmaps/LuggPolylineView.kt

@@ -8,6 +8,7 @@ import com.google.android.gms.maps.model.Polyline
 
 interface LuggPolylineViewDelegate {
   fun polylineViewDidUpdate(polylineView: LuggPolylineView)
+  fun polylineViewDidDrop(polylineView: LuggPolylineView)
 }
 
 data class AnimatedOptions(val duration: Long = 2150L, val easing: String = "linear", val trailLength: Float = 1f, val delay: Long = 0L)
@@ -67,8 +68,8 @@ class LuggPolylineView(context: Context) : ReactViewGroup(context) {
   }
 
   fun onDropViewInstance() {
+    delegate?.polylineViewDidDrop(this)
     delegate = null
-    polyline?.remove()
     polyline = null
   }
 }

android/src/main/java/com/luggmaps/core/GoogleMapProvider.kt

@@ -598,6 +598,10 @@ class GoogleMapProvider(private val context: Context) :
     syncPolylineView(polylineView)
   }
 
+  override fun polylineViewDidDrop(polylineView: LuggPolylineView) {
+    teardownPolyline(polylineView)
+  }
+
   // endregion
 
   // region PolygonViewDelegate
@@ -773,8 +777,12 @@ class GoogleMapProvider(private val context: Context) :
   }
 
   override fun removePolylineView(polylineView: LuggPolylineView) {
-    polylineAnimators[polylineView]?.destroy()
-    polylineAnimators.remove(polylineView)
+    teardownPolyline(polylineView)
+  }
+
+  private fun teardownPolyline(polylineView: LuggPolylineView) {
+    pendingPolylineViews.remove(polylineView)
+    polylineAnimators.remove(polylineView)?.destroy()
     polylineView.polyline?.remove()
     polylineView.polyline = null
   }
@@ -812,6 +820,8 @@ class GoogleMapProvider(private val context: Context) :
   private fun addPolylineViewToMap(polylineView: LuggPolylineView) {
     val map = googleMap ?: return
 
+    polylineAnimators.remove(polylineView)?.destroy()
+
     val options = PolylineOptions()
       .width(polylineView.strokeWidth.dpToPx())
       .zIndex(polylineView.zIndex)

android/src/main/java/com/luggmaps/core/PolylineAnimator.kt

@@ -249,7 +249,7 @@ class PolylineAnimator {
     // Clear spans before setting points to prevent IndexOutOfBoundsException
     // when the new points list is shorter than what existing spans reference
     poly.color = strokeColors.firstOrNull() ?: Color.BLACK
-    poly.points = ArrayList(reusablePoints)
+    poly.points = reusablePoints
 
     if (strokeColors.size > 1) {
       val segmentCount = reusablePoints.size - 1