Initial Commit

apps/testbed/.storybook/main.ts

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+import type { StorybookConfig } from "@storybook/react-vite";
+
+const config: StorybookConfig = {
+  framework: "@storybook/react-vite",
+  stories: ["../src/**/*.stories.@(ts|tsx)"],
+  addons: [
+    "@storybook/addon-essentials",
+    "@storybook/addon-interactions",
+    "@storybook/test",
+  ],
+  docs: { autodocs: "tag" },
+};
+
+export default config;

apps/testbed/.storybook/preview.tsx

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+import type { Decorator, Preview } from "@storybook/react";
+
+const ThemeDecorator: Decorator = (Story) => (
+  <div style={{ display: "flex", gap: "16px" }}>
+    <div data-theme="light" style={{ flex: 1 }}>
+      <Story />
+    </div>
+    <div data-theme="dark" style={{ flex: 1, backgroundColor: "#09090b", padding: "8px" }}>
+      <Story />
+    </div>
+  </div>
+);
+
+const LocaleDecorator: Decorator = (Story) => (
+  <div lang="en">
+    <Story />
+  </div>
+);
+
+const preview: Preview = {
+  decorators: [ThemeDecorator, LocaleDecorator],
+  parameters: {
+    controls: {
+      matchers: {
+        color: /(background|color)$/i,
+        date: /Date$/i,
+      },
+    },
+  },
+};
+
+export default preview;