feat(player): the side panel's list controls and watch toggle are glyphs on one line

The queue row (previous, count, next, auto-advance, loop) wrapped onto three lines in the
narrow side panel; glyph-only, it fits one. Mark watched joins the action icons as a toggle
(check / double check). Every control keeps its full name and shortcut as its tooltip and
accessible name; the docked bar keeps its labels. The related switch moves up to the toolbar
rung (12px), and its second side reads just "Trending".

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

@@ -31,7 +31,7 @@
     "title": "Related",
     "region": "Which related videos",
     "topical": "On topic",
-    "hu": "Hungarian trending",
+    "hu": "Trending",
     "followed": "You follow this channel",
     "empty": "No related videos you haven't seen yet.",
     "emptySoFar": "Nothing you haven't seen among these yet — there are more.",

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

@@ -31,7 +31,7 @@
     "title": "Kapcsolódók",
     "region": "Milyen kapcsolódó videók",
     "topical": "Témába vágó",
-    "hu": "Magyar trend",
+    "hu": "Trend",
     "followed": "Követed ezt a csatornát",
     "empty": "Nincs olyan kapcsolódó videó, amit még nem láttál.",
     "emptySoFar": "Ezek közt még nincs olyan, amit nem láttál — van több is.",