Marcel 15d9bb1b78 feat(briefwechsel): add ConversationThumbnail with aspect + page badge
Reads thumbnailAspect from the backend and swaps between a 120×168
portrait tile and a 168×120 landscape tile so postcards and photos
don't get cropped into a portrait frame. Shows a page-count badge
top-right for multi-page PDFs, and a pulsing skeleton while the
async thumbnail job hasn't run yet. URL assembly goes through the
existing thumbnailUrl helper so cache-busting stays consistent
with DocumentThumbnail.

Refs #305

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-04-23 14:40:15 +02:00
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