Fix: remote video thumbnails for moov-at-end files (Loops.video)
The poster-frame path fetched only the first 4MB, which decodes only a
faststart mp4. Loops.video and phone exports put the moov atom at the end,
so the head lacked it and ffmpeg produced no thumbnail (looked like a
'long video' regression). Now fetch the whole file when content-length is
within a 64MB cap (works regardless of moov position), falling back to an
8MB head only when the size is unknown or very large. The post-fetch 12MB
cap is scoped to images so it no longer rejects valid video buffers.
Co-Authored-By: Claude Opus 4.8 <noreply@…>
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