feat(player): a roomier YouTube player, its panel shut on demand

- The full-height previous/next strips beside the card are gone: the panel's
  transport row and Shift+arrows step on their own, and the video gains the
  7rem the strips' gutters took.
- Close is one icon in the card's top-right corner (the wide panel's head,
  the stacked card's title row).
- The panel's description is cut to three lines with More / Less
  (ClampedText now takes the linked text as children).
- Wide, the panel shuts to a 2.75rem strip (close, open, previous, next) for
  a bigger video; it stays shut while the queue steps on, and a video opened
  from a card starts it open. Focus moves to the counterpart toggle.
- The wheel has one meaning per place: over a panel (or the stacked card)
  with something to scroll it only scrolls, never falling through to the
  volume at the end; over the video, or a panel that fits, it is the volume.
- A long channel name is cut on the panel's line instead of running the
  20rem panel into a sideways scroll.

frontend/src/components/ui/pressableSelectable.contract.test.ts

@@ -24,7 +24,6 @@ const PLAIN: Record<string, [number, string]> = {
   "LanguageSwitcher.tsx": [1, "an option row"],
   "NavSidebar.tsx": [4, "the account trigger and its menu rows"],
   "PaletteLauncher.tsx": [2, "launcher controls"],
-  "PlayerModal.tsx": [2, "previous / next arrows"],
   "PlaylistsRail.tsx": [1, "the load-error retry"],
   "PlexCollectionEditor.tsx": [1, "a checkbox row in a picker"],
   "PlexInfo.tsx": [1, "the rating filter (a number)"],