Size the run terminal by aspect ratio instead of viewport height

h-[60vh] made the terminal's height track the viewport regardless of
its actual width, so it read as too tall on narrower layouts.
aspect-video keeps it at 16/9 relative to its own width instead.

src/components/runs/xterm-view.tsx

@@ -95,7 +95,7 @@ export const XtermView = forwardRef<XtermViewHandle, XtermViewProps>(
     return (
       <div
         ref={containerRef}
-        className="h-[60vh] overflow-hidden bg-[#101215] p-2"
+        className="aspect-video w-full overflow-hidden bg-[#101215] p-2"
       />
     );
   },