fix: 添加 File System Access API 类型声明

Author: Applesaber

ChuChartManager/Front/src/fs-access.d.ts

@@ -0,0 +1,35 @@
+interface FileSystemFileHandle {
+  getFile(): Promise<File>
+  createWritable(): Promise<FileSystemWritableFileStream>
+}
+
+interface FileSystemDirectoryHandle {
+  getDirectoryHandle(name: string, options?: { create?: boolean }): Promise<FileSystemDirectoryHandle>
+  getFileHandle(name: string, options?: { create?: boolean }): Promise<FileSystemFileHandle>
+  values(): AsyncIterableIterator<FileSystemDirectoryHandle | FileSystemFileHandle>
+  readonly kind: 'directory'
+  readonly name: string
+}
+
+interface FileSystemWritableFileStream extends WritableStream {
+  write(data: BufferSource | Blob | string): Promise<void>
+  close(): Promise<void>
+}
+
+interface ShowOpenFilePickerOptions {
+  id?: string
+  startIn?: string
+  types?: { description?: string; accept: Record<string, string[]> }[]
+  multiple?: boolean
+}
+
+interface ShowDirectoryPickerOptions {
+  id?: string
+  startIn?: string
+  mode?: 'read' | 'readwrite'
+}
+
+interface Window {
+  showOpenFilePicker(options?: ShowOpenFilePickerOptions): Promise<FileSystemFileHandle[]>
+  showDirectoryPicker(options?: ShowDirectoryPickerOptions): Promise<FileSystemDirectoryHandle>
+}