Add delay to continue conversation before listening (#342)

Add a configurable amount of delay (defaulting to 0.5s) after the TTS playback is finished to avoid the mic to capture the end of response during start/continue conversation.

Fixes #313

linux_voice_assistant/satellite.py

@@ -714,11 +714,25 @@ class VoiceSatelliteProtocol(APIServer):
         self.send_messages([VoiceAssistantAnnounceFinished()])
 
         if self._continue_conversation:
-            self.send_messages([VoiceAssistantRequest(start=True)])
-            self._is_streaming_audio = True
+            self._continue_conversation = False
+            # Keep pipeline active during the settle delay so the mic stays closed
+            # and does not capture the tail end of the TTS audio from the speaker.
             self._pipeline_active = True
-            _LOGGER.debug("Continuing conversation")
+            _LOGGER.debug("Continuing conversation after %.2fs settle delay", self.state.continue_conversation_delay)
+
+            def _start_continued_conversation() -> None:
+                if self.state.muted:
+                    _LOGGER.debug("Skipping continued conversation: muted")
+                    self._pipeline_active = False
+                    self.unduck()
+                    return
+                self.send_messages([VoiceAssistantRequest(start=True)])
+                self._is_streaming_audio = True
+                _LOGGER.debug("Continued conversation started")
+
+            threading.Timer(self.state.continue_conversation_delay, _start_continued_conversation).start()
         else:
+            self._continue_conversation = False
             self.unduck()
 
         _LOGGER.debug("TTS response finished")