feat(ui): migrate to svelte-5 and storybook

packages/ui/.storybook/preview.ts

@@ -0,0 +1,29 @@
+import { withThemeByClassName } from "@storybook/addon-themes";
+import type { Preview } from '@storybook/svelte';
+
+import "../src/lib/app.css";
+
+const preview: Preview = {
+  parameters: {
+    controls: {
+      matchers: {
+        color: /(background|color)$/i,
+        date: /Date$/i,
+      },
+    },
+  },
+  decorators: [withThemeByClassName({
+    themes: {
+      dark: 'theme-dark',
+      light: 'theme-light',
+      catppuccin: 'theme-catppuccin',
+      solarized: 'theme-solarized',
+      high: 'theme-high-contrast',
+      nord: 'theme-nord',
+      dracula: 'theme-dracula',
+    },
+    defaultTheme: 'light',
+  })],
+};
+
+export default preview;