fix(storybook): Design Tokens altijd bovenaan in Foundations

foundations: null sorteerde alfabetisch waardoor Body vóór Design Tokens
verscheen. Expliciete volgorde: design tokens eerst, * daarna.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Jeffrey Lauwers

packages/storybook/.storybook/main.ts

@@ -7,7 +7,10 @@ import { configureSort } from 'storybook-multilevel-sort';
 configureSort({
   storyOrder: {
     introduction: null,
-    foundations: null,
+    foundations: {
+      'design tokens': null,
+      '*': null,
+    },
     'layout components': {
       '*': { docs: null },
     },