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

ts_web/elements/wysiwyg/instructions.md

@@ -0,0 +1,3 @@
+* We don't use lit template logic, but use static`` here to handle dom operations ourselves
+* We try to have separated concerns in different classes
+* We try to have clean concise and managable code