scripts/build-og-image.ts (renamed from .mjs, run via tsx) now also
queries getAvisosAmbientales and rasterizes a 1200x630 PNG per aviso at
public/og/avis/[origen]-[id].png. The SVG is built inline from the aviso
fields: title (truncated to 110 chars), summary (200), source and
municipio as meta line. [slug].astro passes /og/avis/<slug>.png + the
title as alt to BaseLayout, which emits og:image, og:image:alt,
twitter:image and twitter:image:alt automatically.
e2e: detail page test now also asserts og:image points at the per-aviso
PNG and that the PNG returns 200. 20/20 e2e pass; check and eslint
clean.
Add scripts/build-og-image.mjs (sharp) hooked as npm prebuild to materialize a 1200x630 PNG alongside the SVG. BaseLayout now points og:image/twitter:image at the PNG, which the major crawlers preview reliably (SVG support is patchy). The SVG stays in the repo as the source of truth.
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