refactor(wysiwyg): Clean up code and ensure drag-drop works with programmatic rendering

- Update drag handler to work without requestUpdate calls
- Remove duplicate modal methods (using WysiwygModalManager)
- Clean up unused imports and methods
- Ensure all DOM updates are programmatic
- Add comprehensive test files for all features
- Follow separation of concerns principles

readme.hints.md

@@ -466,4 +466,51 @@ Fixed persistent focus loss issue by implementing fully programmatic rendering:
    }
    ```
 
-This approach completely eliminates focus loss by taking full control of the DOM and preventing any framework-induced re-renders during editing.
+This approach completely eliminates focus loss by taking full control of the DOM and preventing any framework-induced re-renders during editing.
+
+### Code Refactoring and Cleanup (2025-06-24 - Part 11)
+
+Completed comprehensive refactoring to ensure clean, maintainable code with separated concerns:
+
+#### Refactoring Changes:
+
+1. **Drag and Drop Handler Cleanup**:
+   - Removed all `requestUpdate()` calls from drag handler
+   - Handler now only updates internal state
+   - Parent component handles DOM updates programmatically
+   - Simplified drag state management
+
+2. **Unused Code Removal**:
+   - Removed duplicate `showBlockSettingsModal` method (using WysiwygModalManager)
+   - Removed duplicate `showLanguageSelectionModal` method
+   - Removed unused `renderBlock` method
+   - Cleaned up unused imports (WysiwygBlocks, ISlashMenuItem)
+
+3. **Import Cleanup**:
+   - Removed unused type imports
+   - Organized imports logically
+   - Kept only necessary dependencies
+
+4. **Separated Concerns**:
+   - Modal management in WysiwygModalManager
+   - Block operations in WysiwygBlockOperations
+   - Input handling in WysiwygInputHandler
+   - Keyboard handling in WysiwygKeyboardHandler
+   - Drag/drop in WysiwygDragDropHandler
+   - Each class has a single responsibility
+
+5. **Programmatic DOM Management**:
+   - All DOM updates happen through explicit methods
+   - No reactive re-renders during user interaction
+   - Manual class management for drag states
+   - Direct DOM manipulation for performance
+
+6. **Test Files Created**:
+   - `test-focus-fix.html` - Verifies focus management
+   - `test-drag-drop.html` - Tests drag and drop functionality
+   - `test-comprehensive.html` - Tests all features together
+
+The refactoring follows the principles in instructions.md:
+- Uses static templates with manual DOM operations
+- Maintains separated concerns in different classes
+- Results in clean, concise, and manageable code