fix: align partner media with production CMS data

tests/int/cms-media-field.int.spec.ts

@@ -0,0 +1,13 @@
+import { describe, expect, it } from 'vitest'
+
+import { mediaUrl, normalizeMediaUrl } from '@/spa/cmsMediaField'
+
+describe('CMS media URLs', () => {
+  it('preserves Payload file endpoints used by production', () => {
+    expect(normalizeMediaUrl('/api/media/file/image%20(26).jpg')).toBe('/api/media/file/image%20(26).jpg')
+  })
+
+  it('builds a Payload file endpoint when only a filename is populated', () => {
+    expect(mediaUrl({ filename: 'image (26).jpg' }, '')).toBe('/api/media/file/image%20(26).jpg')
+  })
+})