fix(web): dual-write marketplace banner impressions

Clicks already go to Amplitude and __marketplaceTracking__. Impressions
only hit Amplitude, so marketplace.dify.ai never recorded views.

web/app/components/plugins/marketplace/home/__tests__/home-trending.spec.tsx

@@ -3,12 +3,18 @@ import { act, fireEvent, render, screen, within } from '@testing-library/react'
 import userEvent from '@testing-library/user-event'
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { trackEvent } from '@/app/components/base/amplitude'
+import { trackMarketplaceSiteEvent } from '@/utils/marketplace-site-track'
 import HomeTrending from '../home-trending'
 
 vi.mock('@/app/components/base/amplitude', () => ({
   trackEvent: vi.fn(),
 }))
 
+vi.mock('@/utils/marketplace-site-track', () => ({
+  rememberMarketplaceSiteReferrer: vi.fn(),
+  trackMarketplaceSiteEvent: vi.fn(),
+}))
+
 vi.mock('#i18n', async () => {
   const { withSelectorKey } = await import('@/test/i18n-mock')
   return {
@@ -110,6 +116,7 @@ const banners: PluginBanner[] = [
 ]
 
 const mockTrackEvent = vi.mocked(trackEvent)
+const mockTrackMarketplaceSiteEvent = vi.mocked(trackMarketplaceSiteEvent)
 
 beforeEach(() => {
   vi.clearAllMocks()
@@ -746,4 +753,63 @@ describe('HomeTrending', () => {
       style_type: 'event',
     })
   })
+
+  it('dual-writes banner impressions to Amplitude and marketplace site tracking', () => {
+    vi.useFakeTimers()
+    const observers: Array<{ callback: IntersectionObserverCallback }> = []
+    class MockIntersectionObserver {
+      disconnect = vi.fn()
+      observe = vi.fn()
+      root: Element | Document | null = null
+      rootMargin = '0px'
+      takeRecords = () => []
+      thresholds = [0.5]
+      unobserve = vi.fn()
+
+      constructor(callback: IntersectionObserverCallback) {
+        observers.push({ callback })
+      }
+    }
+    vi.stubGlobal('IntersectionObserver', MockIntersectionObserver)
+
+    try {
+      const blogBanner = banners[1]
+      if (!blogBanner) throw new Error('Expected a blog banner fixture')
+
+      render(<HomeTrending banners={[blogBanner]} isMarketplacePlatform page="plugins" />)
+
+      const observer = observers.at(-1)
+      if (!observer) throw new Error('Expected IntersectionObserver to be registered')
+
+      act(() => {
+        observer.callback(
+          [
+            {
+              intersectionRatio: 0.5,
+              isIntersecting: true,
+            } as IntersectionObserverEntry,
+          ],
+          {} as IntersectionObserver,
+        )
+      })
+      act(() => {
+        vi.advanceTimersByTime(1000)
+      })
+
+      const properties = {
+        banner_id: 'blog',
+        sort: 1,
+        page: 'plugins',
+        language: 'en',
+        style_type: 'blog',
+      }
+      expect(mockTrackEvent).toHaveBeenCalledWith('marketplace_banner_impression', properties)
+      expect(mockTrackMarketplaceSiteEvent).toHaveBeenCalledWith(
+        'marketplace_banner_impression',
+        properties,
+      )
+    } finally {
+      vi.useRealTimers()
+    }
+  })
 })

web/app/components/plugins/marketplace/home/home-trending.tsx

@@ -11,6 +11,7 @@ import { cn } from '@langgenius/dify-ui/cn'
 import { useCallback, useEffect, useRef, useState } from 'react'
 import { useTranslation } from '#i18n'
 import { trackEvent } from '@/app/components/base/amplitude'
+import { trackMarketplaceSiteEvent } from '@/utils/marketplace-site-track'
 import TrendingNavigation from './home-trending-navigation'
 import { HomeBannerSlide } from './home-trending-slides'
 import styles from './home-trending.module.css'
@@ -50,13 +51,15 @@ function TrackedBannerSlide({
   useBannerViewability(
     slideRef,
     () => {
-      trackEvent('marketplace_banner_impression', {
+      const properties = {
         banner_id: banner.id,
         sort: banner.sort,
         page,
         language: banner.language,
         style_type: banner.style_type,
-      })
+      }
+      trackEvent('marketplace_banner_impression', properties)
+      trackMarketplaceSiteEvent('marketplace_banner_impression', properties)
     },
     isActive,
   )