feat(characters): support character-scoped conversations

src/app/chat/components/voice-bubble.tsx

@@ -7,6 +7,7 @@ import { useCachedChatMediaUrl } from "@/lib/chat/use_cached_chat_media_url";
 import styles from "./voice-bubble.module.css";
 
 export interface VoiceBubbleProps {
+  characterId: string;
   messageId?: string;
   audioUrl?: string | null;
   isFromAI: boolean;
@@ -17,6 +18,7 @@ export interface VoiceBubbleProps {
 }
 
 export function VoiceBubble({
+  characterId,
   messageId,
   audioUrl,
   isFromAI,
@@ -31,6 +33,7 @@ export function VoiceBubble({
   const hasAudio = audioUrl != null && audioUrl.length > 0;
   const { mediaUrl, isUsingCachedMedia, reportMediaError } =
     useCachedChatMediaUrl({
+      characterId,
       messageId,
       remoteUrl: audioUrl,
       kind: "audio",