fix(sync): add FILE_SYNC_LIST_FILES electron IPC handler and fix preload args

Add missing IPC handler for file listing used by local-file sync, and fix
preload.ts passing bare dirPath string instead of the expected { dirPath }
object — causing IPC handler to destructure undefined.

electron/electronAPI.d.ts

@@ -48,7 +48,7 @@ export interface ElectronAPI {
 
   fileSyncRemove(args: { filePath: string }): Promise<unknown | Error>;
 
-  fileSyncListFiles(args: { dirPath: string }): Promise<string[] | Error>; // NEW
+  fileSyncListFiles(args: { dirPath: string }): Promise<string[] | Error>;
 
   checkDirExists(args: { dirPath: string }): Promise<true | Error>;
 

electron/local-file-sync.ts

@@ -112,6 +112,36 @@ export const initLocalFileSyncAdapter = (): void => {
         return true;
       } catch (e) {
         log('ERR: error while checking dir ' + dirPath);
+        if ((e as NodeJS.ErrnoException).code === 'EACCES') {
+          log(
+            'ERR: Permission denied. If running as a snap, ensure the "home" or "removable-media" interface is connected.',
+          );
+        }
+        error(e);
+        return e instanceof Error ? e : new Error(String(e));
+      }
+    },
+  );
+
+  ipcMain.handle(
+    IPC.FILE_SYNC_LIST_FILES,
+    (
+      ev,
+      {
+        dirPath,
+      }: {
+        dirPath: string;
+      },
+    ): string[] | Error => {
+      try {
+        return readdirSync(dirPath);
+      } catch (e) {
+        log('ERR: Sync error while listing files in ' + dirPath);
+        if ((e as NodeJS.ErrnoException).code === 'EACCES') {
+          log(
+            'ERR: Permission denied. If running as a snap, ensure the "home" or "removable-media" interface is connected.',
+          );
+        }
         error(e);
         return e instanceof Error ? e : new Error(String(e));
       }

electron/preload.ts

@@ -49,8 +49,8 @@ const ea: ElectronAPI = {
       dataStr: string | undefined;
     }>,
   fileSyncRemove: (filePath) => _invoke('FILE_SYNC_REMOVE', filePath) as Promise<void>,
-  fileSyncListFiles: ({ dirPath }) =>
-    _invoke('FILE_SYNC_LIST_FILES', dirPath) as Promise<string[] | Error>,
+  fileSyncListFiles: (args) =>
+    _invoke('FILE_SYNC_LIST_FILES', args) as Promise<string[] | Error>,
   checkDirExists: (dirPath) =>
     _invoke('CHECK_DIR_EXISTS', dirPath) as Promise<true | Error>,
 

electron/shared-with-frontend/ipc-events.const.ts

@@ -43,7 +43,7 @@ export enum IPC {
   FILE_SYNC_LOAD = 'FILE_SYNC_LOAD',
   FILE_SYNC_SAVE = 'FILE_SYNC_SAVE',
   FILE_SYNC_REMOVE = 'FILE_SYNC_REMOVE',
-  FILE_SYNC_LIST_FILES = 'FILE_SYNC_LIST_FILES', // NEW
+  FILE_SYNC_LIST_FILES = 'FILE_SYNC_LIST_FILES',
   FILE_SYNC_GET_REV_AND_CLIENT_UPDATE = 'FILE_SYNC_GET_REV_AND_CLIENT_UPDATE',
 
   CHECK_DIR_EXISTS = 'CHECK_DIR_EXISTS',

src/app/op-log/sync-providers/file-based/local-file/file-adapter.interface.ts

@@ -3,5 +3,5 @@ export interface FileAdapter {
   writeFile(filePath: string, dataStr: string): Promise<void>;
   deleteFile(filePath: string): Promise<void>;
   checkDirExists?(dirPath: string): Promise<boolean>;
-  listFiles?(dirPath: string): Promise<string[]>; // NEW
+  listFiles?(dirPath: string): Promise<string[]>;
 }