fix(web): keep marketplace route layout on the server

A client marketplace layout wrapping the async page makes Flight
double-resolve streamed children (`reason.enqueueModel`) on
cloud.dify.dev/marketplace.

web/app/(commonLayout)/marketplace/__tests__/layout.spec.tsx

@@ -0,0 +1,33 @@
+import { readFileSync } from 'node:fs'
+import { dirname, resolve } from 'node:path'
+import { fileURLToPath } from 'node:url'
+import { render, screen } from '@testing-library/react'
+import { describe, expect, it, vi } from 'vitest'
+
+vi.mock('../document-title', () => ({
+  default: () => <span>marketplace document title</span>,
+}))
+
+describe('marketplace route layout', () => {
+  it('stays a server module so Flight can stream the async marketplace page', () => {
+    const source = readFileSync(
+      resolve(dirname(fileURLToPath(import.meta.url)), '../layout.tsx'),
+      'utf8',
+    )
+
+    expect(source).not.toMatch(/^['"]use client['"]/)
+  })
+
+  it('renders marketplace children and the document title island', async () => {
+    const { default: MarketplaceLayout } = await import('../layout')
+
+    render(
+      <MarketplaceLayout>
+        <p>marketplace page</p>
+      </MarketplaceLayout>,
+    )
+
+    expect(screen.getByText('marketplace document title')).toBeInTheDocument()
+    expect(screen.getByText('marketplace page')).toBeInTheDocument()
+  })
+})

web/app/(commonLayout)/marketplace/document-title.tsx

@@ -0,0 +1,12 @@
+'use client'
+
+import { useTranslation } from 'react-i18next'
+import useDocumentTitle from '@/hooks/use-document-title'
+
+const MarketplaceDocumentTitle = () => {
+  const { t } = useTranslation()
+  useDocumentTitle(t(($) => $['mainNav.marketplace'], { ns: 'common' }))
+  return null
+}
+
+export default MarketplaceDocumentTitle

web/app/(commonLayout)/marketplace/layout.tsx

@@ -1,12 +1,14 @@
-'use client'
-
 import type { PropsWithChildren } from 'react'
-import { useTranslation } from 'react-i18next'
-import useDocumentTitle from '@/hooks/use-document-title'
+import MarketplaceDocumentTitle from './document-title'
 
+// This route layout must stay a Server Component. A client layout wrapping the
+// async marketplace page makes Flight double-resolve streamed children
+// (`reason.enqueueModel`) when opening /marketplace from cloud.dify.dev.
 export default function MarketplaceLayout({ children }: PropsWithChildren) {
-  const { t } = useTranslation()
-  useDocumentTitle(t(($) => $['mainNav.marketplace'], { ns: 'common' }))
-
-  return children
+  return (
+    <>
+      <MarketplaceDocumentTitle />
+      {children}
+    </>
+  )
 }