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* feat(artwork): preserve animated image artwork during resize Detect animated GIFs, WebPs, and APNGs via lightweight byte scanning and preserve their animation when serving resized artwork. Animated GIFs are converted to animated WebP via ffmpeg with optional downscaling; animated WebP/APNG are returned as-is since ffmpeg cannot re-encode them. Adds ConvertAnimatedImage to the FFmpeg interface for piping stdin data through ffmpeg with animated WebP output. * fix(artwork): address code review feedback for animated artwork Fix ReadCloser leak where ffmpeg pipe's Close was discarded by io.NopCloser wrapping — now preserves ReadCloser semantics when the resized reader already supports Close. Use uint64 for PNG chunk position to prevent potential overflow on 32-bit platforms. Add integration tests for the animation branching logic in resizeImage.