Use semantic colors in themes (#5796)

Co-authored-by: Jacob Richman <jacob314@gmail.com>

packages/cli/src/ui/themes/github-light.ts

@@ -5,6 +5,7 @@
  */
 
 import { type ColorsTheme, Theme } from './theme.js';
+import { lightSemanticColors } from './semantic-tokens.js';
 
 const githubLightColors: ColorsTheme = {
   type: 'light',
@@ -144,4 +145,5 @@ export const GitHubLight: Theme = new Theme(
     },
   },
   githubLightColors,
+  lightSemanticColors,
 );