fix(editor): turbo renderer placeholder for built in template (#11793)

Fixed compat error for new built-in template with test updated.

![image.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/lEGcysB4lFTEbCwZ8jMv/f8c69d3f-9602-4509-994b-7243b26b4656.png)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

- **New Features**
  - Added an option to enable or disable bitmap rendering in the renderer settings.
  - Introduced a cooldown period after zooming before block optimization resumes, improving rendering performance and stability.

- **Bug Fixes**
  - Improved handling of cases where block components may be missing, preventing potential runtime errors.

- **Tests**
  - Expanded and refined tests to verify zooming behavior, bitmap caching, and internal state transitions for enhanced reliability.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/blocks/code/src/turbo/code-layout-handler.ts

@@ -25,7 +25,9 @@ export class CodeLayoutHandlerExtension extends BlockLayoutHandlerExtension<Code
     host: EditorHost,
     viewportRecord: ViewportRecord
   ): CodeLayout | null {
-    const component = host.std.view.getBlock(model.id) as GfxBlockComponent;
+    const component = host.std.view.getBlock(
+      model.id
+    ) as GfxBlockComponent | null;
     if (!component) return null;
 
     const codeBlockElement = component.querySelector(