Self-audit catch: my earlier cover-art commit claimed 'the frontend's
<img onerror> fallback handles 404s' — that was wrong. The enhanced
search result images in shared-helpers.js renderCompactSection and all
five gsearch-item/track templates in downloads.js render bare
`<img src="...">` with no fallback. With the MusicBrainz adapter now
emitting Cover Art Archive URLs deterministically (no HEAD probe),
albums that don't have cover art would show the browser's broken-image
icon instead of the emoji placeholder.
Two fallback shapes:
- shared-helpers.js renderCompactSection: the `<img>` sits inside a
card with a sibling placeholder pattern. On error, replace the img's
outerHTML with the placeholder div, matching the shape used when
config.image is missing entirely.
- downloads.js gsearch items: the `<img>` sits inside a
`.gsearch-item-art` div whose default text content is the emoji fallback
(🎤 / 💿 / 🎶 / 🎵). On error, set parentElement.textContent to the
emoji, which wipes the img and shows the glyph. Same shape as the
"no image_url" branch.
Applies to every card type that renders a user-provided image URL so
the fix covers all sources that might return 404s — MB is the most
common offender but iTunes/Deezer/Discogs can all miss too.
Tested against the live MB API: Metallica albums without CAA cover art
now show the 💿 emoji instead of a broken-image icon.
a6359a2690
