Notification sound added. Docs updated.

internal/app/clipboard.go

@@ -54,6 +54,14 @@ type echoSpeaker struct {
 }
 
 func (s *echoSpeaker) Say(text string) {
+	s.Speaker.Say(s.prepare_text(text))
+}
+
+func (s *echoSpeaker) Say_after(text string, before func(context.Context)) {
+	s.Speaker.Say_after(s.prepare_text(text), before)
+}
+
+func (s *echoSpeaker) prepare_text(text string) string {
 	if text != "" {
 		s.last = text
 	}
@@ -65,7 +73,7 @@ func (s *echoSpeaker) Say(text string) {
 		}
 		text = s.punctuation.Process_text(text, s.punctuationLevel, options)
 	}
-	s.Speaker.Say(text)
+	return text
 }
 
 // Character feedback bypasses text expansion, including punctuation in names.