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/no-diagnostic-logs.test.js

@@ -0,0 +1,19 @@
+/**
+ * Tests ensuring production code does not contain leftover diagnostic console.log statements.
+ */
+
+const fs = require('fs');
+const path = require('path');
+
+describe('No leftover diagnostic console.log statements', () => {
+  const rootDir = path.resolve(__dirname, '..');
+  const filesToCheck = ['src/main.js', 'src/renderer.js'];
+
+  filesToCheck.forEach((relativePath) => {
+    test(`${relativePath} has no console.log statements`, () => {
+      const content = fs.readFileSync(path.join(rootDir, relativePath), 'utf8');
+      const matches = content.match(/console\.log\(/g) || [];
+      expect(matches).toHaveLength(0);
+    });
+  });
+});