chore: add more stories (#27403)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

web/app/components/base/effect/index.stories.tsx

@@ -0,0 +1,39 @@
+/* eslint-disable tailwindcss/classnames-order */
+import type { Meta, StoryObj } from '@storybook/nextjs'
+import Effect from '.'
+
+const meta = {
+  title: 'Base/Other/Effect',
+  component: Effect,
+  parameters: {
+    docs: {
+      description: {
+        component: 'Blurred circular glow used as a decorative background accent. Combine with relatively positioned containers.',
+      },
+      source: {
+        language: 'tsx',
+        code: `
+<div className="relative h-40 w-72 overflow-hidden rounded-2xl bg-background-default-subtle">
+  <Effect className="top-6 left-8" />
+</div>
+        `.trim(),
+      },
+    },
+  },
+  tags: ['autodocs'],
+} satisfies Meta<typeof Effect>
+
+export default meta
+type Story = StoryObj<typeof meta>
+
+export const Playground: Story = {
+  render: () => (
+    <div className="relative h-40 w-72 overflow-hidden rounded-2xl border border-divider-subtle bg-background-default-subtle">
+      <Effect className="top-6 left-8" />
+      <Effect className="top-14 right-10 bg-util-colors-purple-brand-purple-brand-500" />
+      <div className="absolute inset-x-0 bottom-4 flex justify-center text-xs text-text-secondary">
+        Accent glow
+      </div>
+    </div>
+  ),
+}