Add Help Menu in NodeLibrarySidebarTab (#3922)

Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Claude <noreply@anthropic.com>

src/utils/nodeHelpUtil.ts

@@ -0,0 +1,23 @@
+import type { ComfyNodeDefImpl } from '@/stores/nodeDefStore'
+import { NodeSourceType, getNodeSource } from '@/types/nodeSource'
+
+export function extractCustomNodeName(
+  pythonModule: string | undefined
+): string | null {
+  const modules = pythonModule?.split('.') || []
+  if (modules.length >= 2 && modules[0] === 'custom_nodes') {
+    return modules[1].split('@')[0]
+  }
+  return null
+}
+
+export function getNodeHelpBaseUrl(node: ComfyNodeDefImpl): string {
+  const nodeSource = getNodeSource(node.python_module)
+  if (nodeSource.type === NodeSourceType.CustomNodes) {
+    const customNodeName = extractCustomNodeName(node.python_module)
+    if (customNodeName) {
+      return `/extensions/${customNodeName}/docs/`
+    }
+  }
+  return `/docs/${node.name}/`
+}