feat(editor): support preview mode in code block (#11805)

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

- **New Features**
  - Introduced a preview mode for code blocks, allowing users to toggle between code and rendered previews (e.g., HTML output) directly within the editor.
  - Added a preview toggle button to the code block toolbar for supported languages.
  - Enabled dynamic rendering of code block previews using a shared WebContainer, allowing live HTML previews in an embedded iframe.
  - Added HTML preview support with loading and error states for enhanced user feedback.
  - Integrated the preview feature as a view extension provider for seamless framework support.

- **Bug Fixes**
  - Improved toolbar layout and button alignment for a cleaner user interface.

- **Tests**
  - Added end-to-end tests to verify the new code block preview functionality and language switching behavior.

- **Chores**
  - Updated development server configuration to include enhanced security headers.
  - Added a new runtime dependency for WebContainer support.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/model/src/blocks/code/code-model.ts

@@ -12,6 +12,7 @@ type CodeBlockProps = {
   language: string | null;
   wrap: boolean;
   caption: string;
+  preview?: boolean;
 } & BlockMeta;
 
 export const CodeBlockSchema = defineBlockSchema({
@@ -22,6 +23,7 @@ export const CodeBlockSchema = defineBlockSchema({
       language: null,
       wrap: false,
       caption: '',
+      preview: undefined,
       'meta:createdAt': undefined,
       'meta:createdBy': undefined,
       'meta:updatedAt': undefined,