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

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

docs/developer_portal/sidebars.js

@@ -26,6 +26,9 @@ module.exports = {
       collapsed: true,
       items: [
         'contributing/overview',
+        'guidelines/design-guidelines',
+        'guidelines/frontend-style-guidelines',
+        'guidelines/backend-style-guidelines',
       ],
     },
     {
@@ -61,5 +64,20 @@ module.exports = {
         'testing/overview',
       ],
     },
+    {
+      type: 'category',
+      label: 'UI Components',
+      collapsed: true,
+      link: {
+        type: 'doc',
+        id: 'components/index',
+      },
+      items: [
+        {
+          type: 'autogenerated',
+          dirName: 'components',
+        },
+      ],
+    },
   ],
 };