파일/디렉터리 목록 캐싱 추가

src/lib/stores/file.ts

@@ -0,0 +1,30 @@
+import type { Writable } from "svelte/store";
+
+export type DirectoryInfo =
+  | {
+      id: "root";
+      dataKey?: undefined;
+      dataKeyVersion?: undefined;
+      name?: undefined;
+      subDirectoryIds: number[];
+      fileIds: number[];
+    }
+  | {
+      id: number;
+      dataKey: CryptoKey;
+      dataKeyVersion: Date;
+      name: string;
+      subDirectoryIds: number[];
+      fileIds: number[];
+    };
+
+export interface FileInfo {
+  id: number;
+  dataKey: CryptoKey;
+  dataKeyVersion: Date;
+  contentIv: string;
+  name: string;
+}
+
+export const directoryInfoStore = new Map<"root" | number, Writable<DirectoryInfo | null>>();
+export const fileInfoStore = new Map<number, Writable<FileInfo | null>>();