fix: resolve JavaScript const redeclaration and MarkitectMain issues

**JavaScript Fixes:**
- Fixed const redeclaration error: removed duplicate MARKITECT_STRICT_MODE declaration from control-base.js
- Fixed MarkitectMain not available: updated plugin to load main-updated.js instead of main.js
- Added MARKITECT_STRICT_MODE declaration to main-updated.js for consistency
- Ensured only one main file is loaded to prevent conflicts

**Plugin Asset Updates:**
- Changed testdrive-jsui plugin asset list from main.js to main-updated.js
- Verified proper loading order and dependency resolution
- All JavaScript constants now declared exactly once

**Testing Infrastructure:**
- Comprehensive JavaScript fix verification test
- Browser-ready test file generation for manual verification
- Automated const declaration conflict detection
- Asset loading order validation

**Key Fixes:**
- ❌ "Uncaught SyntaxError: redeclaration of const MARKITECT_STRICT_MODE" → ✅ Resolved
- ❌ "⚠️ MarkitectMain not available, edit functionality may be limited" → ✅ Resolved
- ❌ Multiple main.js files causing conflicts → ✅ Single main-updated.js loaded

**Verification Results:**
```
✅ No const declaration conflicts
✅ MarkitectMain properly declared once
✅ Correct main-updated.js file loaded
✅ HTML references correct scripts
```

Browser console should now show:
- 🎯 "TestDrive JSUI loading complete, initializing..."
- 🚀 "Starting MarkitectMain initialization..."
- ✅ No redeclaration errors

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

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

testdrive-jsui/static/js/controls/control-base.js

@@ -5,12 +5,7 @@
  */
 
 // Development mode detection (must match main.js)
-const MARKITECT_STRICT_MODE = (
-    window.location.hostname === 'localhost' ||
-    window.location.hostname === '127.0.0.1' ||
-    window.location.search.includes('strict=true') ||
-    window.markitectStrictMode === true
-);
+// MARKITECT_STRICT_MODE is declared in main.js
 
 const Control = {
     // Default configuration