feat(ui): add Storybook design system refinements

frontend/.storybook/main.js

@@ -0,0 +1,13 @@
+/** @type { import('@storybook/react-vite').StorybookConfig } */
+const config = {
+  stories: ['../src/**/*.stories.{js,jsx,ts,tsx}'],
+  addons: [
+    '@storybook/addon-essentials',
+    '@storybook/addon-interactions',
+  ],
+  framework: {
+    name: '@storybook/react-vite',
+    options: {},
+  },
+};
+export default config;

frontend/.storybook/preview.js

@@ -0,0 +1,5 @@
+import '../src/styles.css';
+
+export const parameters = {
+  layout: 'fullscreen',
+};