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/i18n/locales/en/player.json

@@ -24,6 +24,10 @@
   "description": "Description",
   "noDescription": "No description.",
   "descriptionFailed": "Couldn't load the description",
+  "descriptionMore": "More",
+  "descriptionLess": "Less",
+  "collapsePanel": "Hide the details",
+  "expandPanel": "Show the details",
   "channel": "Channel",
   "views": "{{formattedCount}} views",
   "stream": "stream",

frontend/src/i18n/locales/hu/player.json

@@ -24,6 +24,10 @@
   "description": "Leírás",
   "noDescription": "Nincs leírás.",
   "descriptionFailed": "Nem sikerült betölteni a leírást",
+  "descriptionMore": "Több",
+  "descriptionLess": "Kevesebb",
+  "collapsePanel": "Részletek elrejtése",
+  "expandPanel": "Részletek megjelenítése",
   "channel": "Csatorna",
   "views": "{{formattedCount}} megtekintés",
   "stream": "élő adás",