macOS: extract attributed string helper

apps/macos/Sources/Clawdis/NSAttributedString+VoiceWake.swift

@@ -0,0 +1,9 @@
+import Foundation
+
+extension NSAttributedString {
+    func strippingForegroundColor() -> NSAttributedString {
+        let mutable = NSMutableAttributedString(attributedString: self)
+        mutable.removeAttribute(.foregroundColor, range: NSRange(location: 0, length: mutable.length))
+        return mutable
+    }
+}

apps/macos/Sources/Clawdis/VoiceWakeOverlay.swift

@@ -663,11 +663,3 @@ private final class TranscriptNSTextView: NSTextView {
         super.keyDown(with: event)
     }
 }
-
-private extension NSAttributedString {
-    func strippingForegroundColor() -> NSAttributedString {
-        let mutable = NSMutableAttributedString(attributedString: self)
-        mutable.removeAttribute(.foregroundColor, range: NSRange(location: 0, length: mutable.length))
-        return mutable
-    }
-}