feat(SPA): media library indications for custom medial field type usage

web/src/views/__tests__/MediaSelection.spec.ts

@@ -357,7 +357,7 @@ describe('Bulk delete', () => {
 		const box = dialog()!
 		expect(textOf(box)).toContain('Delete 3 images?')
 		expect(textOf(box)).toContain(
-			"2 of them are used in 5 articles, which will show a broken image. The other one isn't used anywhere. This can't be undone.",
+			"2 of them are used in 5 places, which will show a broken image or a missing-image notice. The other one isn't used anywhere. This can't be undone.",
 		)
 		const rows = Array.from(box.querySelectorAll('[data-testid="bulk-delete-row"]')).map(textOf)
 		expect(rows).toEqual([