Add UI for conversation trigger (#17037)

src/data/trigger.ts

@@ -9,6 +9,7 @@ import {
   mdiMapMarker,
   mdiMapMarkerRadius,
   mdiMessageAlert,
+  mdiMicrophoneMessage,
   mdiNfcVariant,
   mdiNumeric,
   mdiStateMachine,
@@ -27,6 +28,7 @@ export const TRIGGER_TYPES = {
   mqtt: mdiSwapHorizontal,
   numeric_state: mdiNumeric,
   sun: mdiWeatherSunny,
+  conversation: mdiMicrophoneMessage,
   tag: mdiNfcVariant,
   template: mdiCodeBraces,
   time: mdiClockOutline,