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Giphy and Tenor link previews forced every GIF into the same box — full card width, max 200px tall, object-fit: cover — whatever its shape: a square GIF lost half its height, a portrait one three quarters (only the middle band showed, so captions and faces at the top/bottom were cut), and a 100×80 GIF was blown up 4×. utils/gifPreviewSize.ts (unit-tested) fits the GIF inside 400×320 from og:image:width/height, keeping its aspect ratio and enlarging small GIFs at most 2×. The card centres the GIF on the surface colour with object-fit: contain, reserves the box before it loads, and the GIF badge sits on the GIF's corner. Without dimensions it shows at natural size, capped by the card. The >10 MB thumbnail fallback is requested at 2× the box (800×640) so it isn't upscaled. Verified headless (fixture previews, desktop / Pixel 7 / 320px phone): 480×200 → 398×166, 300×300 → 320×320 (292×292 on 320px), 240×480 → 160×320, 100×80 → 200×160, all 100% visible; the no-dimension fallback and narrow cards keep the ratio. tsc clean, 1325 unit tests pass, eslint 0 errors (36 warnings, unchanged), prettier clean. Fixes #341 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA