feat: add AVIF format support #31
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Extend the HEIC parser to also detect and parse AVIF image files. Both formats use the same ISOBMFF container structure, differing only in the image codec (HEVC vs AV1). The parser now recognizes AVIF brand codes: avif, avis, av01. Closes #1 (work-001) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
avif,avis,av01Why extend HEIC instead of separate parser?
AVIF and HEIC share identical container structure (ISO Base Media File Format). Only the image codec differs (AV1 vs HEVC). Creating a separate parser would duplicate 100% of the parsing logic for no benefit.
Closes #1 (work-001)
Test plan
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