refactor(characters): drive shared UI from active character

src/stores/private-room/private-room-context.tsx

@@ -4,8 +4,6 @@ import type { Dispatch, ReactNode } from "react";
 import { createActorContext, shallowEqual } from "@xstate/react";
 import type { SnapshotFrom } from "xstate";
 
-import { DEFAULT_CHARACTER_ID } from "@/data/constants/character";
-
 import { privateRoomMachine } from "./private-room-machine";
 import type {
   PrivateRoomEvent,
@@ -34,12 +32,12 @@ const PrivateRoomActorContext = createActorContext(privateRoomMachine);
 
 export interface PrivateRoomProviderProps {
   children: ReactNode;
-  characterId?: string;
+  characterId: string;
 }
 
 export function PrivateRoomProvider({
   children,
-  characterId = DEFAULT_CHARACTER_ID,
+  characterId,
 }: PrivateRoomProviderProps) {
   return (
     <PrivateRoomActorContext.Provider options={{ input: { characterId } }}>