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/blocks/code/src/code-preview-extension.ts

@@ -0,0 +1,27 @@
+import type { CodeBlockModel } from '@blocksuite/affine-model';
+import { createIdentifier } from '@blocksuite/global/di';
+import type { ExtensionType } from '@blocksuite/store';
+import type { HTMLTemplateResult } from 'lit';
+
+export type CodeBlockPreviewRenderer = (
+  model: CodeBlockModel
+) => HTMLTemplateResult | null;
+
+export type CodeBlockPreviewContext = {
+  renderer: CodeBlockPreviewRenderer;
+  lang: string;
+};
+
+export const CodeBlockPreviewIdentifier =
+  createIdentifier<CodeBlockPreviewContext>('CodeBlockPreview');
+
+export function CodeBlockPreviewExtension(
+  lang: string,
+  renderer: CodeBlockPreviewRenderer
+): ExtensionType {
+  return {
+    setup: di => {
+      di.addImpl(CodeBlockPreviewIdentifier(lang), { renderer, lang });
+    },
+  };
+}