feat: comprehensive control panel UI improvements

- Fix version information display with actual Markitect version
- Implement auto-resize functionality with double-click on resize dot
- Add viewport repositioning to keep panels visible during auto-resize
- Reduce title bar height by 25% for more compact appearance
- Remove duplicate content titles below titlebars across all panels
- Optimize scrollbar positioning to right border with proper spacing
- Reposition resize dot to optimal corner location (bottom: 0px, right: -4px)
- Set default panel height to 1/3 of window height
- Fix Debug panel title formatting consistency
- Remove duplicate initialization warnings
- Clean up panel layout with proper margin management (10px bottom margin)

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

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

testdrive-jsui/templates/index.html

@@ -97,25 +97,15 @@
     <!-- Initialization Script -->
     <script>
         window.addEventListener('load', function() {
-            console.log('🎯 TestDrive JSUI loading complete, initializing...');
+            console.log('🎯 TestDrive JSUI loading complete');
 
             // Handle CDN loading errors
             if (window.markitectMarkedError) {
                 console.error("CDN library failed to load - network or firewall blocking marked.js");
             }
 
-            // Initialize main application
-            try {
-                if (typeof MarkitectMain !== 'undefined') {
-                    console.log('🚀 Starting MarkitectMain initialization...');
-                    MarkitectMain.initialize();
-                } else {
-                    console.warn('⚠️ MarkitectMain not available, edit functionality may be limited');
-                }
-            } catch (error) {
-                console.error('❌ TestDrive JSUI initialization failed:', error);
-                console.log('📄 Content should still be visible in fallback mode');
-            }
+            // Note: MarkitectMain auto-initializes via main-updated.js
+            // No manual initialization needed here
         });
     </script>
 </body>