fix(wysiwyg): Implement programmatic rendering to eliminate focus loss during typing

- Convert parent component to use static rendering with programmatic DOM manipulation
- Remove all reactive state that could trigger re-renders during editing
- Delay content sync to avoid interference with typing (2s auto-save)
- Update all block operations to use manual DOM updates instead of Lit re-renders
- Fix specific issue where typing + arrow keys caused focus loss
- Add comprehensive focus management documentation

readme.hints.md

@@ -409,4 +409,61 @@ Created `wysiwyg.interfaces.ts` with proper typing:
 4. Arrow keys handle block navigation without focus loss
 5. All timing is handled via proper async/await patterns
 
-The refactoring eliminates race conditions and timing issues that were causing focus loss and content duplication problems.
+The refactoring eliminates race conditions and timing issues that were causing focus loss and content duplication problems.
+
+### Programmatic Rendering Solution (2025-06-24 - Part 10)
+
+Fixed persistent focus loss issue by implementing fully programmatic rendering:
+
+#### The Problem:
+- User would click in a block, type text, then press arrow keys and lose focus
+- Root cause: Lit was re-rendering components when block content was mutated
+- Even with shouldUpdate() preventing re-renders, parent re-evaluation caused focus loss
+
+#### The Solution:
+
+1. **Static Parent Rendering**:
+   - Parent component renders only once with empty editor content div
+   - All blocks are created and managed programmatically via DOM manipulation
+   - No Lit re-renders triggered by state changes
+
+2. **Manual Block Management**:
+   - `renderBlocksProgrammatically()` creates all block elements manually
+   - `createBlockElement()` builds block wrapper with all event handlers
+   - `updateBlockElement()` replaces individual blocks when needed
+   - No reactive properties trigger parent re-renders
+
+3. **Content Update Strategy**:
+   - During typing, content is NOT immediately synced to data model
+   - Auto-save delayed to 2 seconds to avoid interference
+   - Content synced from DOM only on blur or before save
+   - `syncAllBlockContent()` reads from DOM when needed
+
+4. **Focus Preservation**:
+   - Block components prevent re-renders with `shouldUpdate()`
+   - Parent never re-renders after initial load
+   - Focus remains stable during all editing operations
+   - Arrow key navigation works without focus loss
+
+5. **Implementation Details**:
+   ```typescript
+   // Parent render method - static after first render
+   render(): TemplateResult {
+     return html`
+       <div class="editor-content" id="editor-content">
+         <!-- Blocks rendered programmatically -->
+       </div>
+     `;
+   }
+   
+   // All block operations use DOM manipulation
+   private renderBlocksProgrammatically() {
+     this.editorContentRef.innerHTML = '';
+     this.blocks.forEach(block => {
+       const blockWrapper = this.createBlockElement(block);
+       this.editorContentRef.appendChild(blockWrapper);
+     });
+   }
+   ```
+
+This approach completely eliminates focus loss by taking full control of the DOM and preventing any framework-induced re-renders during editing.