fix: resolve Sendable closure error in ResultsView

Use DispatchQueue.main.async to avoid Swift 6 strict concurrency
checking on the time observer callback.

Author: holywen

Sources/SubScript/Views/ResultsView.swift

@@ -60,8 +60,10 @@ struct ResultsView: View {
 
     private func setupTimeObserver() {
         let interval = CMTime(seconds: 0.1, preferredTimescale: 600)
-        player?.addPeriodicTimeObserver(forInterval: interval, queue: .main) { time in
-            self.currentTime = time.seconds
+        player?.addPeriodicTimeObserver(forInterval: interval, queue: .main) { [weak self] time in
+            DispatchQueue.main.async {
+                self?.currentTime = time.seconds
+            }
         }
     }