Release v1.8.0: Enhanced Word Export in Batch Converter

Added enhanced Word export with template support to the batch file converter,
enabling batch conversion of markdown files to professionally-styled DOCX
documents using custom templates.

New Features:
- Added "DOCX (Enhanced)" option to batch converter format selection
- Integrated WordTemplateExporter with batch conversion workflow
- Batch converter now supports template-based Word export with:
  * Custom template preservation
  * Professional table styling (orange headers, white data rows)
  * Perfect ASCII art and flowchart alignment
  * Red-colored arrows in flowcharts
  * Markdown numbering stripped from headings and lists

Technical Changes:
- Modified performBatchConversion() to handle 'docx-enhanced' format
- Async/await pattern for WordTemplateExporter in batch processing
- Proper error handling and progress tracking for enhanced exports
- Updated version to v1.8.0 in package.json, main.js, and README.md

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "pan-converter",
-  "version": "1.7.9",
+  "version": "1.8.0",
   "description": "Cross-platform Markdown editor and converter using Pandoc",
   "main": "src/main.js",
   "scripts": {
@@ -31,6 +31,7 @@
   },
   "dependencies": {
     "codemirror": "^6.0.2",
+    "core-util-is": "^1.0.3",
     "docx": "^9.5.1",
     "docx4js": "^3.3.0",
     "dompurify": "^3.2.6",