Add state management for NPC presence mode and time window

src/app/App.tsx

@@ -1975,6 +1975,14 @@ export function App({ store, initialStatusMessage }: AppProps) {
     String(DEFAULT_SCENE_ENTRY_YAW_DEGREES)
   );
   const [npcActorIdDraft, setNpcActorIdDraft] = useState("");
+  const [npcPresenceModeDraft, setNpcPresenceModeDraft] =
+    useState<NpcPresenceMode>(createNpcAlwaysPresence().mode);
+  const [npcPresenceStartHourDraft, setNpcPresenceStartHourDraft] = useState(
+    String(DEFAULT_NPC_TIME_WINDOW_START_HOUR)
+  );
+  const [npcPresenceEndHourDraft, setNpcPresenceEndHourDraft] = useState(
+    String(DEFAULT_NPC_TIME_WINDOW_END_HOUR)
+  );
   const [npcYawDraft, setNpcYawDraft] = useState(
     String(DEFAULT_NPC_YAW_DEGREES)
   );