Tighten xterm terminal line height

1.4 was too loose for a log/terminal view; 1.2 stays readable while
fitting more output on screen.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/src/components/runs/xterm-view.tsx

@@ -60,7 +60,7 @@ export const XtermView = forwardRef<XtermViewHandle, XtermViewProps>(
         disableStdin: true,
         cursorBlink: false,
         fontSize: 12,
-        lineHeight: 1.4,
+        lineHeight: 1.2,
         fontFamily: "ui-monospace, Menlo, monospace",
         theme,
       });