- Never let a non-authoritative MeTube 'updated' event downgrade a
terminal job (it refilled the progress bar after completion).
- Self-heal stale active jobs against MeTube history on status polls,
so a missed event no longer leaves a job stuck in 'queued'.
- Build YT.Player on an imperatively created child div: React keeps
owning the container, so switching to the local copy after a
download no longer throws removeChild and blanks the page.
- Autoplay on open and seek controls; subtitle experiment reverted.
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