fix(ios): pass fit in Rive constructor, bump rive-ios to 6.19.1

Passes fit directly in the Rive() constructor instead of setting it
after creation. Removes the layoutSubviews workaround since rive-ios
6.19.1 fixes the MTKView drawable timing issue (rive-ios#443).

Author: mfazekas

ios/new/HybridRiveFileFactory.swift

@@ -1,4 +1,4 @@
-@_spi(RiveExperimental) import RiveRuntime
+import RiveRuntime
 import NitroModules
 
 final class HybridRiveFileFactory: HybridRiveFileFactorySpec, @unchecked Sendable {
@@ -24,8 +24,9 @@ final class HybridRiveFileFactory: HybridRiveFileFactorySpec, @unchecked Sendabl
       let data = try await HTTPDataLoader.shared.downloadData(from: fileURL)
       RCTLog("[HybridRiveFileFactory] fromURL: downloaded \(data.count) bytes")
       let worker = try await HybridRiveFileFactory.sharedWorkerTask.value
-      RCTLog("[HybridRiveFileFactory] fromURL: got shared worker")
+      RCTLog("[HybridRiveFileFactory] fromURL: got shared worker, referencedAssets=\(referencedAssets == nil ? "nil" : "\(referencedAssets!.data?.count ?? -1) assets"), keys=\(referencedAssets?.data?.keys.sorted() ?? [])")
       await ExperimentalAssetLoader.registerAssets(referencedAssets, on: worker)
+      RCTLog("[HybridRiveFileFactory] fromURL: assets registered, creating file...")
       let file = try await File(source: .data(data), worker: worker)
       RCTLog("[HybridRiveFileFactory] fromURL: created file")
       return HybridRiveFile(file: file, worker: worker)

ios/new/HybridRiveView.swift

@@ -1,4 +1,4 @@
-@_spi(RiveExperimental) import RiveRuntime
+import RiveRuntime
 import Foundation
 import NitroModules
 import UIKit

ios/new/RiveReactNativeView.swift

@@ -1,7 +1,6 @@
 import RiveRuntime
 import NitroModules
 import UIKit
-import MetalKit
 
 enum ExperimentalBindData {
   case none
@@ -28,23 +27,8 @@ class RiveReactNativeView: UIView {
   private var isViewReady = false
   private var configTask: Task<Void, Never>?
   private var isPaused = false
-  private var pendingFit: RiveRuntime.Fit?
-
   var autoPlay: Bool = true
 
-  override func layoutSubviews() {
-    super.layoutSubviews()
-    applyPendingFitIfMTKViewReady()
-  }
-
-  // https://github.com/rive-app/rive-nitro-react-native/pull/231
-  private func applyPendingFitIfMTKViewReady() {
-    guard let fit = pendingFit, let rive = riveInstance,
-          riveUIView?.subviews.contains(where: { $0 is MTKView }) == true else { return }
-    rive.fit = fit
-    pendingFit = nil
-  }
-
   func awaitViewReady() async -> Bool {
     if !isViewReady {
       await withCheckedContinuation { continuation in
@@ -101,7 +85,8 @@ class RiveReactNativeView: UIView {
             file: config.file,
             artboard: artboard,
             stateMachine: stateMachine,
-            dataBind: dataBind
+            dataBind: dataBind,
+            fit: config.fit
           )
 
           guard !Task.isCancelled else { return }
@@ -110,8 +95,6 @@ class RiveReactNativeView: UIView {
           self.riveInstance = rive
           self.setupRiveUIView(with: rive)
 
-          self.pendingFit = config.fit
-
           if config.autoPlay {
             self.isPaused = false
           }