enhance(client): emojisはIndexedDBに保存する (#10121)

* enhance(client): emojisはIndexedDBに保存する

* lastEmojisFetchedAt

packages/frontend/src/local-storage.ts

@@ -2,8 +2,6 @@ type Keys =
 	'v' |
 	'lastVersion' |
 	'instance' |
-	'emojis' | // TODO: indexed db
-	'lastEmojisFetchedAt' |
 	'account' |
 	'accounts' |
 	'latestDonationInfoShownAt' |
@@ -28,7 +26,9 @@ type Keys =
 	`miux:${string}` |
 	`ui:folder:${string}` |
 	`themes:${string}` |
-	`aiscript:${string}`;
+	`aiscript:${string}` |
+	'lastEmojisFetchedAt' | // DEPRECATED, stored in indexeddb (13.9.0~)
+	'emojis' // DEPRECATED, stored in indexeddb (13.9.0~);
 
 export const miLocalStorage = {
 	getItem: (key: Keys) => window.localStorage.getItem(key),