feat: setup storybook for glyphdiff project

.storybook/preview.ts

@@ -0,0 +1,23 @@
+import type { Preview } from '@storybook/svelte-vite';
+
+import '../src/app/styles/app.css';
+
+const preview: Preview = {
+    parameters: {
+        controls: {
+            matchers: {
+                color: /(background|color)$/i,
+                date: /Date$/i,
+            },
+        },
+
+        a11y: {
+            // 'todo' - show a11y violations in the test UI only
+            // 'error' - fail CI on a11y violations
+            // 'off' - skip a11y checks entirely
+            test: 'todo',
+        },
+    },
+};
+
+export default preview;