[backport core/1.42] feat: expose renderMarkdownToHtml on ExtensionManager (#10719)

Backport of #10700 to `core/1.42`

Automatically created by backport workflow.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-10719-backport-core-1-42-feat-expose-renderMarkdownToHtml-on-ExtensionManager-3326d73d36508124bb21d6b2a5119402)
by [Unito](https://www.unito.io)

Co-authored-by: Christian Byrne <cbyrne@comfy.org>

src/stores/workspaceStore.ts

@@ -9,6 +9,7 @@ import type { Settings } from '@/schemas/apiSchema'
 import { useColorPaletteService } from '@/services/colorPaletteService'
 import { useDialogService } from '@/services/dialogService'
 import type { SidebarTabExtension, ToastManager } from '@/types/extensionTypes'
+import { renderMarkdownToHtml } from '@/utils/markdownRendererUtil'
 
 import { useApiKeyAuthStore } from './apiKeyAuthStore'
 import { useCommandStore } from './commandStore'
@@ -113,7 +114,8 @@ function workspaceStoreSetup() {
 
     registerSidebarTab,
     unregisterSidebarTab,
-    getSidebarTabs
+    getSidebarTabs,
+    renderMarkdownToHtml
   }
 }
 

src/types/extensionTypes.ts

@@ -117,6 +117,14 @@ export interface ExtensionManager {
   // Execution error state (read-only)
   lastNodeErrors: Record<NodeId, NodeError> | null
   lastExecutionError: ExecutionErrorWsMessage | null
+
+  /**
+   * Renders a markdown string to sanitized HTML.
+   * Uses marked (GFM) + DOMPurify. Safe for direct use with innerHTML.
+   * @param markdown - The markdown string to render.
+   * @param baseUrl - Optional base URL for resolving relative image/media paths.
+   */
+  renderMarkdownToHtml(markdown: string, baseUrl?: string): string
 }
 
 export interface CommandManager {