feat: 解码 worker 化、Playwright E2E 测试体系与文件夹对比（0.6.0）

src/preload/index.ts

@@ -22,6 +22,30 @@ export interface FileOpenError {
 /** 打开文件结果：成功数据 / 失败原因 / 用户取消（null） */
 export type FileOpenResult = FileData | FileOpenError | null
 
+/** 文件夹对比条目状态（与主进程 folderScan 对齐） */
+export type FolderEntryStatus = 'same' | 'different' | 'left-only' | 'right-only'
+
+/** 文件夹对比单个条目 */
+export interface FolderEntry {
+  rel: string
+  status: FolderEntryStatus
+  leftSize: number | null
+  rightSize: number | null
+  approximate?: boolean
+}
+
+/** 文件夹扫描结果 */
+export interface FolderScanResult {
+  entries: FolderEntry[]
+  truncated: boolean
+  total: number
+}
+
+/** 文件夹扫描失败（目录不存在/不可读） */
+export interface FolderScanError {
+  error: 'scan-failed'
+}
+
 /** 主进程暴露给渲染进程的安全 API */
 const api = {
   openFile: (side?: 'left' | 'right'): Promise<FileOpenResult> =>
@@ -33,7 +57,13 @@ const api = {
   showInFolder: (filePath: string): Promise<boolean> =>
     ipcRenderer.invoke('file:show-in-folder', filePath),
   setClipboard: (text: string): Promise<boolean> =>
-    ipcRenderer.invoke('clipboard:write', text)
+    ipcRenderer.invoke('clipboard:write', text),
+  pickFolder: (): Promise<string | null> =>
+    ipcRenderer.invoke('folder:pick'),
+  scanFolder: (leftDir: string, rightDir: string): Promise<FolderScanResult | FolderScanError> =>
+    ipcRenderer.invoke('folder:scan', leftDir, rightDir),
+  readByPath: (filePath: string): Promise<FileOpenResult> =>
+    ipcRenderer.invoke('file:read-by-path', filePath)
 }
 
 export type DiffLensApi = typeof api