Deep-review remediation on the frontend, all findings adversarially verified:
- LibraryPlayer picks audio vs video from the canonical media_kind (single source), not a
hardcoded container whitelist, so an uploaded audio file with an uncommon/absent container
renders in <audio> instead of a broken video box (legacy null media_kind keeps the heuristic).
- UploadDialog aborts the in-flight upload when the dialog is closed by X/ESC/backdrop/Back
(not only the footer Cancel); drag highlight uses an enter/leave depth counter to stop the
flicker; the progress bar gets a stable role=progressbar aria-label with the value on aria-valuenow.
- DownloadCenter's Shared tab renders honest loading/error states instead of a blank panel, and
the library/shared row-action gating moves to a single tested helper (lib/downloadActions).
Tests: downloadActions gating matrix, the uploadReq XHR path (abort/401/422-localize/onerror),
and the media_kind-driven audio/video branch.
i18n: downloads.upload.uploadProgress (HU + EN).
peter
f41c81eb56