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>

markitect/clean_document_manager.py

@@ -1324,7 +1324,14 @@ MISSING: {len(missing_components)} components
             config['version'] = f"{version_info['repo_name']} v{version_info['version']}{version_info['git_info']}"
             config['repoName'] = version_info['repo_name']
         else:
-            config['version'] = 'Markitect v0.8.1'
+            # Get version from CLI command as fallback
+            import subprocess
+            try:
+                result = subprocess.run(['markitect', '--version'], capture_output=True, text=True, timeout=5)
+                actual_version = result.stdout.strip() if result.returncode == 0 else '0.8.1.dev44+gf788ccdfd.d20251114'
+            except:
+                actual_version = '0.8.1.dev44+gf788ccdfd.d20251114'
+            config['version'] = f'Markitect v{actual_version}'
             config['repoName'] = 'Markitect'
 
         # Add insert mode specific config