Replaces the hand-rolled inline-data-URL placeholder with a static SVG
asset at /placeholders/album-fallback.svg. SvelteKit's adapter-static
publishes everything in web/static/ at the URL root and the Go binary
embeds the build output, so this resolves identically in dev and prod.
Operator can swap the artwork by replacing the file — no code changes.
Test updated to use toContain rather than strict equality, since jsdom
resolves relative URLs against the test origin.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
