Read Aloud: Preview shows the widget + visible toast feedback

- Preview button now drives the app-level TTSController (wired to the
  recorder widget), so it shows the same "Speaking" widget a real trigger
  does — a reliable way to see Read Aloud working without selecting text
- TTSController.notify now surfaces a visible toast (no text selected,
  missing API key, errors) instead of only an esc beep

Author: thefourcraft

native-macos/Zerm/TextToSpeech/TTSController.swift

@@ -107,5 +107,6 @@ final class TTSController: ObservableObject {
     private func notify(_ message: String) {
         statusMessage = message
         logger.notice("\(message, privacy: .public)")
+        NotificationManager.shared.showNotification(title: message, type: .info, duration: 3.0)
     }
 }

native-macos/Zerm/Views/Settings/TextToSpeechSettingsView.swift

@@ -12,9 +12,9 @@ struct TextToSpeechSettingsView: View {
     @State private var verifyState: VerifyState = .idle
     @State private var isPreviewing = false
 
-    /// Retained so preview playback isn't cut off when the action returns.
-    /// Does not call `registerHotkey()`, so it never double-binds the global shortcut.
-    @StateObject private var previewController = TTSController()
+    /// The app-level controller (wired to the recorder widget), so Preview shows the same
+    /// "Speaking" widget a real trigger does — a reliable way to see Read Aloud working.
+    @EnvironmentObject private var ttsController: TTSController
 
     @ObservedObject private var kokoro = KokoroModelManager.shared
     @EnvironmentObject private var hotkeyManager: HotkeyManager
@@ -286,7 +286,7 @@ struct TextToSpeechSettingsView: View {
     private func preview() async {
         isPreviewing = true
         defer { isPreviewing = false }
-        await previewController.speak("This is how the selected voice sounds in Zerm.")
+        await ttsController.speak("This is how the selected voice sounds in Zerm.")
         // brief settle so synthesis can start before the button re-enables
         try? await Task.sleep(nanoseconds: 1_200_000_000)
     }