Play a completed library item in-app: a Play button on Library rows (and
Shared rows with download access) opens a modal that streams the local file
into a native <video controls> (or <audio> for audio-only assets).
Rather than the YouTube IFrame PlayerModal or the Plex HLS PlexPlayer — both
bound to their own domain APIs and unable to point at a local file — this
reuses the shared Modal a11y shell (focus-trap, ESC, layer-stack, portal) and
the range-aware /api/downloads/{id}/file endpoint. S4a's universal-codec
guarantee (mp4/H.264/AAC + m4a/mp3) makes native playback always work, so seek,
volume, fullscreen and speed come for free with zero transcode.
peter
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