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

tests/project-meta.test.js

@@ -0,0 +1,21 @@
+/**
+ * Tests for project metadata consistency
+ */
+
+const fs = require('fs');
+const path = require('path');
+
+describe('Project version consistency', () => {
+  const rootDir = path.resolve(__dirname, '..');
+  const packageJson = JSON.parse(fs.readFileSync(path.join(rootDir, 'package.json'), 'utf8'));
+  const readme = fs.readFileSync(path.join(rootDir, 'README.md'), 'utf8');
+
+  test('README version matches package.json version', () => {
+    const version = packageJson.version;
+    expect(readme).toContain(`v${version}`);
+  });
+
+  test('README contains current version string', () => {
+    expect(readme).toContain('v4.4.4');
+  });
+});