feat(theming): expand theme to include borderRadii.lg value

Author: jzempel

packages/theming/src/elements/theme/__snapshots__/index.spec.ts.snap

@@ -3,6 +3,7 @@
 exports[`DEFAULT_THEME matches snapshot 1`] = `
 {
   "borderRadii": {
+    "lg": "8px",
     "md": "4px",
     "sm": "2px",
   },

packages/theming/src/elements/theme/index.ts

@@ -12,7 +12,8 @@ const BASE = 4;
 
 const borderRadii = {
   sm: `${BASE / 2}px`,
-  md: `${BASE}px`
+  md: `${BASE}px`,
+  lg: `${BASE * 2}px`
 };
 
 const borderStyles = {