fix(test): DownloadEventRow row shows platform, not artist name

The row template renders status + platform (PlatformChip) + time + counts;
the artist isn't displayed there. Assert on 'Completed'/'Patreon' instead.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/test/components/downloadEventRow.spec.js

@@ -5,7 +5,7 @@ import DownloadEventRow from '../../src/components/downloads/DownloadEventRow.vu
 import { freshPinia, mountComponent } from '../support/mountComponent.js'
 
 describe('DownloadEventRow', () => {
-  it('renders the artist and the mapped status label', () => {
+  it('renders the mapped status label and platform', () => {
     const pinia = freshPinia()
     const now = new Date().toISOString()
     const event = {
@@ -15,7 +15,7 @@ describe('DownloadEventRow', () => {
     }
     const w = mountComponent(DownloadEventRow, { props: { event }, pinia })
     const t = w.text()
-    expect(t).toContain('Alice')
     expect(t).toContain('Completed') // downloadStatusLabel('ok')
+    expect(t).toContain('Patreon')   // platformLabel via PlatformChip
   })
 })