fix: add missing Promise import in experimental Android property files, extract shared async helpers

- Add missing `import com.margelo.nitro.core.Promise` to all 6 experimental
  Android ViewModel property files (Boolean, Color, Enum, List, Number, String)
- Extract private async helpers in iOS new Color and List to eliminate
  non-trivial code duplication between deprecated sync and async methods

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mfazekas

android/src/experimental/java/com/margelo/nitro/rive/HybridViewModelBooleanProperty.kt

@@ -4,6 +4,7 @@ import android.util.Log
 import androidx.annotation.Keep
 import app.rive.ViewModelInstance
 import com.facebook.proguard.annotations.DoNotStrip
+import com.margelo.nitro.core.Promise
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.runBlocking
 

android/src/experimental/java/com/margelo/nitro/rive/HybridViewModelColorProperty.kt

@@ -4,6 +4,7 @@ import android.util.Log
 import androidx.annotation.Keep
 import app.rive.ViewModelInstance
 import com.facebook.proguard.annotations.DoNotStrip
+import com.margelo.nitro.core.Promise
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.runBlocking
 

android/src/experimental/java/com/margelo/nitro/rive/HybridViewModelEnumProperty.kt

@@ -4,6 +4,7 @@ import android.util.Log
 import androidx.annotation.Keep
 import app.rive.ViewModelInstance
 import com.facebook.proguard.annotations.DoNotStrip
+import com.margelo.nitro.core.Promise
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.runBlocking
 

android/src/experimental/java/com/margelo/nitro/rive/HybridViewModelListProperty.kt

@@ -6,6 +6,7 @@ import app.rive.ViewModelInstance
 import app.rive.ViewModelInstanceSource
 import app.rive.core.CommandQueue
 import com.facebook.proguard.annotations.DoNotStrip
+import com.margelo.nitro.core.Promise
 import kotlinx.coroutines.runBlocking
 
 @Keep
@@ -36,26 +37,25 @@ class HybridViewModelListProperty(
     return Promise.async { instance.getListSize(path).toDouble() }
   }
 
+  private suspend fun fetchInstanceAt(index: Double): HybridViewModelInstanceSpec? {
+    val file = parentFile.riveFile ?: return null
+    val source = ViewModelInstanceSource.ReferenceListItem(instance, path, index.toInt())
+    val vmi = ViewModelInstance.fromFile(file, source)
+    return HybridViewModelInstance(vmi, riveWorker, parentFile)
+  }
+
   // Deprecated: Use getInstanceAtAsync instead
   override fun getInstanceAt(index: Double): HybridViewModelInstanceSpec? {
     return try {
-      val file = parentFile.riveFile ?: return null
-      val source = ViewModelInstanceSource.ReferenceListItem(instance, path, index.toInt())
-      val vmi = ViewModelInstance.fromFile(file, source)
-      HybridViewModelInstance(vmi, riveWorker, parentFile)
+      runBlocking { fetchInstanceAt(index) }
     } catch (e: Exception) {
       Log.e(TAG, "getInstanceAt($index) failed for path '$path'", e)
       null
     }
   }
 
   override fun getInstanceAtAsync(index: Double): Promise<HybridViewModelInstanceSpec?> {
-    return Promise.async {
-      val file = parentFile.riveFile ?: return@async null
-      val source = ViewModelInstanceSource.ReferenceListItem(instance, path, index.toInt())
-      val vmi = ViewModelInstance.fromFile(file, source)
-      HybridViewModelInstance(vmi, riveWorker, parentFile)
-    }
+    return Promise.async { fetchInstanceAt(index) }
   }
 
   override fun addInstance(instance: HybridViewModelInstanceSpec) {

android/src/experimental/java/com/margelo/nitro/rive/HybridViewModelNumberProperty.kt

@@ -4,6 +4,7 @@ import android.util.Log
 import androidx.annotation.Keep
 import app.rive.ViewModelInstance
 import com.facebook.proguard.annotations.DoNotStrip
+import com.margelo.nitro.core.Promise
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.runBlocking
 

android/src/experimental/java/com/margelo/nitro/rive/HybridViewModelStringProperty.kt

@@ -4,6 +4,7 @@ import android.util.Log
 import androidx.annotation.Keep
 import app.rive.ViewModelInstance
 import com.facebook.proguard.annotations.DoNotStrip
+import com.margelo.nitro.core.Promise
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.runBlocking
 

ios/new/HybridViewModelColorProperty.swift

@@ -12,12 +12,16 @@ class HybridViewModelColorProperty: HybridViewModelColorPropertySpec {
     super.init()
   }
 
+  private func fetchColorValue() async throws -> Double {
+    let color = try await instance.value(of: prop)
+    return Double(color.argbValue)
+  }
+
   // Deprecated: Use getValueAsync instead (for reading)
   var value: Double {
     get {
       do {
-        let color = try blockingAsync { try await self.instance.value(of: self.prop) }
-        return Double(color.argbValue)
+        return try blockingAsync { try await self.fetchColorValue() }
       } catch {
         RCTLogError("[ColorProperty] getValue failed: \(error)")
         return 0
@@ -34,12 +38,7 @@ class HybridViewModelColorProperty: HybridViewModelColorPropertySpec {
   }
 
   func getValueAsync() throws -> Promise<Double> {
-    let inst = instance
-    let p = prop
-    return Promise.async {
-      let color = try await inst.value(of: p)
-      return Double(color.argbValue)
-    }
+    return Promise.async { try await self.fetchColorValue() }
   }
 
   func addListener(onChanged: @escaping (Double) -> Void) throws -> () -> Void {

ios/new/HybridViewModelListProperty.swift

@@ -36,22 +36,18 @@ class HybridViewModelListProperty: HybridViewModelListPropertySpec {
     }
   }
 
+  private func fetchInstance(at index: Double) async throws -> (any HybridViewModelInstanceSpec)? {
+    let vmi = try await vmiInstance.value(of: prop, at: Int32(index))
+    return HybridViewModelInstance(viewModelInstance: vmi, worker: worker)
+  }
+
   // Deprecated: Use getInstanceAtAsync instead
   func getInstanceAt(index: Double) throws -> (any HybridViewModelInstanceSpec)? {
-    return try blockingAsync {
-      let vmi = try await self.vmiInstance.value(of: self.prop, at: Int32(index))
-      return HybridViewModelInstance(viewModelInstance: vmi, worker: self.worker)
-    }
+    return try blockingAsync { try await self.fetchInstance(at: index) }
   }
 
   func getInstanceAtAsync(index: Double) throws -> Promise<(any HybridViewModelInstanceSpec)?> {
-    let inst = vmiInstance
-    let p = prop
-    let w = worker
-    return Promise.async {
-      let vmi = try await inst.value(of: p, at: Int32(index))
-      return HybridViewModelInstance(viewModelInstance: vmi, worker: w)
-    }
+    return Promise.async { try await self.fetchInstance(at: index) }
   }
 
   func addInstance(instance: any HybridViewModelInstanceSpec) throws {