Peer-review of the exact-format-per-item feature: re-clicking "Preview
formats" on an already-loaded playlist reset info/playlist but left
itemFormats/itemFormatOptions/formatExpanded keyed by position, so a
stale exact-format pick could silently reattach to a different video
landing at the same index in the new probe result and flow into
addPlaylist(). Extracted resetPlaylistItemState() and call it from
both clearProbe() and fetchFormats().
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Each video row in the playlist panel gets an exact-format button that
lazily probes just that entry's URL (reusing the existing single-video
probe IPC, no new main-process code) and shows a native Select of its
real formats. The choice flows through addMany -> formatId per queue
item. Probing is on-demand per row, never all up front, since a
playlist can hold thousands of entries and per-entry probes are
rate-limited.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>