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94e9060dc7
Problem: <video> elements on tfe.php had no <track kind="captions"> element, violating WCAG 4.1.2 (name, role, value) for video content. Changes: - public/tfe.php: collect all text/vtt files from the thesis file list before rendering; skip standalone rendering of .vtt entries; for each MP4 emit a <track kind="captions" srclang="fr" label="Sous-titres" default> pointing to the N-th VTT file (N-th video paired with N-th caption in document order) - public/media.php: add text/vtt to allowed MIME list; normalise finfo text/plain -> text/vtt for .vtt files; add vtt branch to cache/header block (Content-Type: text/vtt; charset=utf-8, 1-day cache) - public/admin/actions/formulaire.php: allow .vtt uploads (text/vtt MIME, vtt extension); normalise text/plain finfo result; set file_type='caption' for VTT files so they are distinguishable from other thesis files - public/admin/add.php: extend files field accept attr to include .vtt; update hint text to document the VTT sidecar convention VTT files uploaded under theses/ inherit the same access_type visibility gate in media.php as all other thesis content (403 for access_type_id=3).