docs(components): federate Storybook stories into Developer Portal MDX (#37502)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

docs/sidebarTutorials.js

@@ -110,9 +110,21 @@ const sidebars = {
         'testing/frontend-testing',
         'testing/backend-testing',
         'testing/e2e-testing',
+        'testing/storybook',
         'testing/ci-cd',
       ],
     },
+    {
+      type: 'category',
+      label: 'UI Components',
+      collapsed: true,
+      items: [
+        {
+          type: 'autogenerated',
+          dirName: 'components',
+        },
+      ],
+    },
     {
       type: 'link',
       label: 'API Reference',