fix(batch): resolve pandoc path handling and include-subfolders option

- Normalize pandoc command parsing with path.basename() to support bundled binary paths
- Use bundled pandoc binary in convertWithPandoc instead of relying on PATH
- Forward includeSubfolders checkbox state from renderer to main process
- Add pandoc availability check before batch conversion
- Re-enable Start button when batch conversion completes
- Clean up obsolete dist build artifact causing test snapshot warning
- Bump version to 4.4.4

src/adapters/types.js

@@ -129,5 +129,5 @@
  */
 
 module.exports = {
-    // Type definitions are JSDoc only, no runtime exports needed
+  // Type definitions are JSDoc only, no runtime exports needed
 };