fix(compass-shell): set width of compass shell to avoid overflow COMPASS-6411 (#3945)

Author: Anemy

packages/compass-shell/src/components/compass-shell/compass-shell.jsx

@@ -24,6 +24,7 @@ const compassShellStyles = css(
     flexBasis: 'auto',
     position: 'relative',
     flexDirection: 'column',
+    width: '100vw',
   },
   getScrollbarStyles(true /* Always show dark mode. */)
 );