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/styles-concreteinfo.css

@@ -675,18 +675,33 @@ body.theme-concreteinfo-dark .modal-footer {
    Animations
    ============================================ */
 @keyframes fadeIn {
-  from { opacity: 0; }
-  to { opacity: 1; }
+  from {
+    opacity: 0;
+  }
+  to {
+    opacity: 1;
+  }
 }
 
 @keyframes slideUp {
-  from { transform: translateY(20px); opacity: 0; }
-  to { transform: translateY(0); opacity: 1; }
+  from {
+    transform: translateY(20px);
+    opacity: 0;
+  }
+  to {
+    transform: translateY(0);
+    opacity: 1;
+  }
 }
 
 @keyframes pulse {
-  0%, 100% { transform: scale(1); }
-  50% { transform: scale(1.05); }
+  0%,
+  100% {
+    transform: scale(1);
+  }
+  50% {
+    transform: scale(1.05);
+  }
 }
 
 .animate-fade-in {