refactor: improve clipboard management and reliability

- Centralize clipboard operations through ClipboardManager

- Remove iOS-specific code

- Improve error handling and user feedback

- Make clipboard restoration non-blocking

- Add proper success/failure status for clipboard operations

- Increase error message visibility duration

- Use background queue for clipboard restoration

VoiceInk/ClipboardManager.swift

@@ -1,14 +1,20 @@
 import SwiftUI
+import AppKit
 
 struct ClipboardManager {
-    static func copyToClipboard(_ text: String) {
-        #if os(macOS)
+    enum ClipboardError: Error {
+        case copyFailed
+        case accessDenied
+    }
+    
+    static func copyToClipboard(_ text: String) -> Bool {
         let pasteboard = NSPasteboard.general
         pasteboard.clearContents()
-        pasteboard.setString(text, forType: .string)
-        #else
-        UIPasteboard.general.string = text
-        #endif
+        return pasteboard.setString(text, forType: .string)
+    }
+    
+    static func getClipboardContent() -> String? {
+        return NSPasteboard.general.string(forType: .string)
     }
 }
 

VoiceInk/CursorPaster.swift

@@ -1,7 +1,9 @@
 import Foundation
-import Cocoa
+import AppKit
 
 class CursorPaster {
+    private static let pasteCompletionDelay: TimeInterval = 0.3
+    
     static func pasteAtCursor(_ text: String) {
         guard AXIsProcessTrusted() else {
             print("Accessibility permissions not granted. Cannot paste at cursor.")
@@ -33,8 +35,9 @@ class CursorPaster {
         vUp?.post(tap: .cghidEventTap)
         cmdUp?.post(tap: .cghidEventTap)
         
-        // Restore the original pasteboard contents
-        DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) {
+        // Restore the original pasteboard contents after a delay
+        // Use a background queue to not block the main thread
+        DispatchQueue.global(qos: .userInitiated).asyncAfter(deadline: .now() + pasteCompletionDelay) {
             if let oldContents = oldContents {
                 pasteboard.clearContents()
                 pasteboard.setString(oldContents, forType: .string)

VoiceInk/Views/TranscriptionHistoryView.swift

@@ -536,9 +536,10 @@ struct TranscriptionCard: View {
     }
     
     private func copyToClipboard(_ text: String) {
-        let pasteboard = NSPasteboard.general
-        pasteboard.clearContents()
-        pasteboard.setString(text, forType: .string)
+        let success = ClipboardManager.copyToClipboard(text)
+        if !success {
+            print("Failed to copy text to clipboard")
+        }
     }
     
     private func formatDuration(_ duration: TimeInterval) -> String {

VoiceInk/WhisperState.swift

@@ -563,8 +563,13 @@ class WhisperState: NSObject, ObservableObject, AVAudioRecorderDelegate {
             SoundManager.shared.playStopSound()
             
             if isAutoCopyEnabled {
-                ClipboardManager.copyToClipboard(text)
-                clipboardMessage = "Transcription copied to clipboard"
+                let success = ClipboardManager.copyToClipboard(text)
+                if success {
+                    clipboardMessage = "Transcription copied to clipboard"
+                } else {
+                    clipboardMessage = "Failed to copy to clipboard"
+                    messageLog += "Failed to copy transcription to clipboard\n"
+                }
             }
             
             if AXIsProcessTrusted() {
@@ -576,11 +581,6 @@ class WhisperState: NSObject, ObservableObject, AVAudioRecorderDelegate {
                 messageLog += "Accessibility permissions not granted. Transcription not pasted automatically.\n"
             }
             
-            Task {
-                try await Task.sleep(nanoseconds: 3_000_000_000)
-                clipboardMessage = ""
-            }
-            
             await cleanupResources()
             
             // Don't set processing states to false here
@@ -628,16 +628,6 @@ class WhisperState: NSObject, ObservableObject, AVAudioRecorderDelegate {
         }
     }
 
-    private func copyToClipboard(_ text: String) {
-        #if os(macOS)
-        let pasteboard = NSPasteboard.general
-        pasteboard.clearContents()
-        pasteboard.setString(text, forType: .string)
-        #else
-        UIPasteboard.general.string = text
-        #endif
-    }
-
     @Published var isVisualizerActive = false
     
     @Published var isMiniRecorderVisible = false {