fix(chat): migrate legacy cache to Elio conversation

src/data/repositories/chat_cache_identity.ts

@@ -1,8 +1,11 @@
 import { LoginStatus } from "@/data/schemas/auth";
 import { AuthStorage, type IAuthStorage } from "@/data/storage/auth";
 import { UserStorage, type IUserStorage } from "@/data/storage/user";
+import { buildChatConversationKey } from "@/lib/chat/chat_cache_keys";
 import { Result, type Result as ResultT } from "@/utils/result";
 
+export { buildChatConversationKey } from "@/lib/chat/chat_cache_keys";
+
 export type ChatCacheIdentityResolver = () => Promise<ResultT<string>>;
 export type ChatConversationKeyResolver = (
   characterId: string,
@@ -53,16 +56,6 @@ export async function resolveChatCacheOwnerKey(
   return Result.err(new Error("Chat cache identity is unavailable."));
 }
 
-export function buildChatConversationKey(
-  ownerKey: string,
-  characterId: string,
-): string {
-  if (ownerKey.trim().length === 0 || characterId.trim().length === 0) {
-    throw new Error("Chat owner and character identities must not be empty.");
-  }
-  return `${ownerKey}::character:${encodeURIComponent(characterId)}`;
-}
-
 export async function resolveChatConversationKey(
   characterId: string,
 ): Promise<ResultT<string>> {

src/data/repositories/chat_media_cache_helpers.ts

@@ -5,16 +5,9 @@ import type {
 } from "@/data/schemas/chat";
 import type { CacheRemoteChatMediaInput } from "@/data/repositories/interfaces";
 import { isCacheableRemoteChatMediaUrl } from "@/lib/chat/chat_media_url";
+import { buildChatMediaCacheKey } from "@/lib/chat/chat_cache_keys";
 
-export { isCacheableRemoteChatMediaUrl };
-
-export function buildChatMediaCacheKey(input: {
-  ownerKey: string;
-  messageId: string;
-  kind: ChatMediaKind;
-}): string {
-  return `${input.ownerKey}:${input.messageId}:${input.kind}`;
-}
+export { buildChatMediaCacheKey, isCacheableRemoteChatMediaUrl };
 
 export function getMessageMediaTargets(
   message: ChatMessage,