Banners/cards used cropResize (fit-inside), so a portrait fallback
source was handed back as a narrow sliver that object-fit:cover then
upscaled into a blur (reported on us-canada-mex-2024). Switch to
cropZoom (crop-to-fill) so the derivative is a real w×h cover strip.
Emit the 2x srcset descriptor only when the source is genuinely >=2w
wide (cover.width >= 2w), else 1x-only — no upscaling, no odd
intermediate widths. Imported pixelfed photos cap at ~1440px wide, so
auto-picked covers are usually 1x-only (see backlog: full-res reimport).
Also drop the no-photos-demo test fixture — it surfaced as stray demo
content in the trip list; AE4 (no cover + no images -> no banner) is a
trivial else-branch of the shared macro's cover guard, covered by
construction alongside the R7/AE3 fallback tests.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RDS6t8wcpbwKvvrxykVQ5K
m038andClaude Opus 4.8
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