fix: remove unused import in bannieres page

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/(dashboard)/bannieres/page.tsx

@@ -2,7 +2,6 @@
 import { useState, useEffect, useRef, useCallback } from 'react'
 import { Header } from '@/components/layout/Header'
 import type { SlideshowSection, Slide } from '@/lib/shopifyTheme'
-import { randomUUID } from 'crypto'
 
 // Convertit "shopify://shop_images/foo.jpg" → URL CDN prévisualisable via proxy
 function shopifyRefToProxyUrl(ref: string): string {