Preserve PNG transparency for static images and show a checkerboard preview.

Static uploads were forced to JPEG with a white fill, which turned white icons into solid squares; PNG sources now stay PNG and CMS previews get a visible background.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/business/src/pages/WebsiteStaticImagesPage.tsx

@@ -20,6 +20,7 @@ import type { BusinessMessageKey } from '../i18n/messages'
 import { ApiError } from '../lib/api'
 import { getBusinessDomain } from '../lib/config'
 import { resolveDataUrlToMediaId } from '../services/mediaService'
+import { uploadFilenameForImageDataUrl } from '../utils/imageUpload'
 import {
   deleteWebsiteStaticImageSlot,
   listWebsiteStaticImageSlots,
@@ -230,7 +231,7 @@ export function WebsiteStaticImagesPage() {
       const occupying = occupyingImage(slot, index)
       const imageMediaId = await resolveDataUrlToMediaId(
         data.image,
-        'static-image.jpg',
+        uploadFilenameForImageDataUrl(data.image ?? '', 'static-image'),
         occupying?.imageMediaId,
       )
       if (!imageMediaId) {