Fix speech authorization crash on device from dispatch queue assertion

Request authorization off main queue and marshal callback result back
via DispatchQueue.main.async. Check current status first to avoid
unnecessary system prompt if already authorized or denied.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Conjuga/Conjuga/Services/PronunciationService.swift

@@ -16,19 +16,29 @@ final class PronunciationService {
     private var recognizerResolved = false
 
     func requestAuthorization() {
-        // SFSpeechRecognizer.requestAuthorization crashes on simulators
-        // without speech services. Check availability first.
-        guard SFSpeechRecognizer.self != nil else { return }
-
         #if targetEnvironment(simulator)
         print("[PronunciationService] skipping speech auth on simulator")
-        isAuthorized = false
+        return
         #else
-        print("[PronunciationService] requesting speech authorization...")
-        SFSpeechRecognizer.requestAuthorization { [weak self] status in
-            print("[PronunciationService] authorization status: \(status.rawValue)")
-            Task { @MainActor in
-                self?.isAuthorized = (status == .authorized)
+        // Check current status first to avoid unnecessary prompt
+        let currentStatus = SFSpeechRecognizer.authorizationStatus()
+        if currentStatus == .authorized {
+            isAuthorized = true
+            return
+        }
+        if currentStatus == .denied || currentStatus == .restricted {
+            isAuthorized = false
+            return
+        }
+
+        // Only request if not determined yet — do it on a background queue
+        // to avoid blocking main thread, then update state on main
+        DispatchQueue.global(qos: .userInitiated).async {
+            SFSpeechRecognizer.requestAuthorization { status in
+                DispatchQueue.main.async { [weak self] in
+                    self?.isAuthorized = (status == .authorized)
+                    print("[PronunciationService] authorization status: \(status.rawValue)")
+                }
             }
         }
         #endif