* fix(browser): compare PNG IHDR bytes without ASCII folding
Screenshot checks already compare the PNG signature as raw bytes, then decoded the chunk type with an encoding that maps high-bit bytes onto IHDR.
Co-authored-by: Cursor <cursoragent@cursor.com>
* fix(browser): satisfy the strict index check in the IHDR test
Co-authored-by: Cursor <cursoragent@cursor.com>
* refactor(browser): share byte-faithful PNG header facts
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Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: REA preparation lane <rea-preparation@localhost>