fix: tighten iOS main-actor handling

apps/ios/Sources/Screen/ScreenController.swift

@@ -294,13 +294,14 @@ extension Double {
 // MARK: - Navigation Delegate
 
 /// Handles navigation policy to intercept clawdis:// deep links from canvas
+@MainActor
 private final class ScreenNavigationDelegate: NSObject, WKNavigationDelegate {
     weak var controller: ScreenController?
 
     func webView(
         _ webView: WKWebView,
         decidePolicyFor navigationAction: WKNavigationAction,
-        decisionHandler: @escaping (WKNavigationActionPolicy) -> Void)
+        decisionHandler: @escaping @MainActor @Sendable (WKNavigationActionPolicy) -> Void)
     {
         guard let url = navigationAction.request.url else {
             decisionHandler(.allow)
@@ -310,9 +311,7 @@ private final class ScreenNavigationDelegate: NSObject, WKNavigationDelegate {
         // Intercept clawdis:// deep links
         if url.scheme == "clawdis" {
             decisionHandler(.cancel)
-            Task { @MainActor in
-                self.controller?.onDeepLink?(url)
-            }
+            self.controller?.onDeepLink?(url)
             return
         }
 
@@ -324,15 +323,11 @@ private final class ScreenNavigationDelegate: NSObject, WKNavigationDelegate {
         didFailProvisionalNavigation _: WKNavigation?,
         withError error: any Error)
     {
-        Task { @MainActor in
-            self.controller?.errorText = error.localizedDescription
-        }
+        self.controller?.errorText = error.localizedDescription
     }
 
     func webView(_: WKWebView, didFail _: WKNavigation?, withError error: any Error) {
-        Task { @MainActor in
-            self.controller?.errorText = error.localizedDescription
-        }
+        self.controller?.errorText = error.localizedDescription
     }
 }
 

apps/ios/Sources/Screen/ScreenRecordService.swift

@@ -3,6 +3,10 @@ import ReplayKit
 
 @MainActor
 final class ScreenRecordService {
+    private struct UncheckedSendableBox<T>: @unchecked Sendable {
+        let value: T
+    }
+
     enum ScreenRecordError: LocalizedError {
         case invalidScreenIndex(Int)
         case captureFailed(String)
@@ -20,6 +24,7 @@ final class ScreenRecordService {
         }
     }
 
+    // swiftlint:disable:next cyclomatic_complexity
     func record(
         screenIndex: Int?,
         durationMs: Int?,
@@ -165,8 +170,10 @@ final class ScreenRecordService {
         videoInput.markAsFinished()
         audioInput?.markAsFinished()
 
+        let writerBox = UncheckedSendableBox(value: writer)
         try await withCheckedThrowingContinuation { (cont: CheckedContinuation<Void, Error>) in
-            writer.finishWriting {
+            writerBox.value.finishWriting {
+                let writer = writerBox.value
                 if let err = writer.error {
                     cont.resume(throwing: ScreenRecordError.writeFailed(err.localizedDescription))
                 } else if writer.status != .completed {

apps/ios/Sources/Voice/VoiceWakeManager.swift

@@ -94,7 +94,7 @@ final class VoiceWakeManager: NSObject {
 
     private var lastDispatched: String?
     private var onCommand: (@Sendable (String) async -> Void)?
-    private nonisolated(unsafe) var userDefaultsObserver: NSObjectProtocol?
+    private var userDefaultsObserver: NSObjectProtocol?
 
     override init() {
         super.init()
@@ -110,7 +110,7 @@ final class VoiceWakeManager: NSObject {
             })
     }
 
-    deinit {
+    @MainActor deinit {
         if let userDefaultsObserver = self.userDefaultsObserver {
             NotificationCenter.default.removeObserver(userDefaultsObserver)
         }