PostCard and PostModal competed for the same data and rendered redundant
chrome (header twice, image grid twice, attachment list twice). The wider
PostCard layout we shipped 2026-05-27 has enough real estate to be the
canonical post surface, so collapse the two into one.
Compact (default) state is unchanged: hero + 3-cell rail + truncated
title + 3/5-line description + attachment count badge. Whole-card click
expands in place. Expanded state shows: full title, mosaic of ALL post
images via PostImageGrid (uncapped, lazy-loaded via getPostFull), full
sanitized-HTML description with paragraph wrapping, attachments as
downloadable pill links. Click the chevron in the header to collapse;
mosaic image clicks open ImageViewer scoped to the post (modalStore's
postImageIds path is preserved — only the comment changed).
Per-card local state — no global modal store. Each PostCard owns its
own expanded ref and lazy-loaded detail; collapsing a card discards
neither (so re-expand is instant after the first fetch).
Deleted: PostModal.vue, postModal.js store. Removed the App.vue mount.