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/pdf-operations.test.js

@@ -8,27 +8,24 @@ describe('PDFOperations Utilities', () => {
   describe('page range parsing', () => {
     it('should parse single page numbers', () => {
       // Test logic: parsing "1" should extract page index 0
-      const input = '1';
       const pages = [0]; // Parsed result
-      
+
       expect(pages.length).toBe(1);
       expect(pages[0]).toBe(0);
     });
 
     it('should parse page ranges', () => {
       // Test logic: parsing "1-3" should extract pages 0, 1, 2
-      const input = '1-3';
       const pages = [0, 1, 2]; // Expected result
-      
+
       expect(pages.length).toBe(3);
       expect(pages).toEqual([0, 1, 2]);
     });
 
     it('should handle multiple ranges', () => {
       // Test logic: parsing "1-2,4-5" should extract pages 0,1,3,4
-      const input = '1-2,4-5';
       const pages = [0, 1, 3, 4]; // Expected result
-      
+
       expect(pages.length).toBe(4);
       expect(pages).toEqual([0, 1, 3, 4]);
     });
@@ -36,7 +33,7 @@ describe('PDFOperations Utilities', () => {
     it('should sort pages in ascending order', () => {
       const unsorted = [2, 0, 3, 1];
       const sorted = unsorted.sort((a, b) => a - b);
-      
+
       expect(sorted).toEqual([0, 1, 2, 3]);
     });
   });
@@ -45,14 +42,14 @@ describe('PDFOperations Utilities', () => {
     it('should validate hex color format', () => {
       const validHex = '#FF5733';
       const isValid = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.test(validHex);
-      
+
       expect(isValid).toBe(true);
     });
 
     it('should detect invalid hex colors', () => {
       const invalidColors = ['#GG5733', '#12345', 'notahex'];
-      
-      invalidColors.forEach(color => {
+
+      invalidColors.forEach((color) => {
         const isValid = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.test(color);
         expect(isValid).toBe(false);
       });
@@ -73,12 +70,12 @@ describe('PDFOperations Utilities', () => {
         { input: '-1', isValid: false },
         { input: 'abc', isValid: false },
         { input: '1', isValid: true },
-        { input: '5', isValid: true }
+        { input: '5', isValid: true },
       ];
-      
+
       testPages.forEach(({ input, isValid }) => {
         const num = parseInt(input);
-        
+
         if (isNaN(num)) {
           // Non-numeric string
           expect(isValid).toBe(false);