Storybook: Add BorderRadiusControl story

packages/block-editor/src/components/border-radius-control/README.md

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+# BorderRadiusControl
+
+`BorderRadiusControl` is a React component that provides a user interface for managing border radius values. It allows users to control the border radius of each corner independently or link them together for uniform values.
+
+## Usage
+
+```jsx
+/**
+ * WordPress dependencies
+ */
+import { __experimentalBorderRadiusControl as BorderRadiusControl } from '@wordpress/block-editor';
+import { useState } from '@wordpress/element';
+
+const MyBorderRadiusControl = () => {
+    const [values, setValues] = useState({
+        topLeft: '10px',
+        topRight: '10px',
+        bottomLeft: '10px',
+        bottomRight: '10px',
+    });
+
+    return (
+        <BorderRadiusControl
+            values={values}
+            onChange={setValues}
+        />
+    );
+};
+```
+
+## Props
+
+### values
+
+An object containing the border radius values for each corner.
+
+- **Type:** `Object`
+- **Required:** No
+- **Default:** `undefined`
+
+The values object has the following schema:
+
+| Property    | Description                          | Type   |
+| ----------- | ------------------------------------ | ------ |
+| topLeft     | Border radius for top left corner    | string |
+| topRight    | Border radius for top right corner   | string |
+| bottomLeft  | Border radius for bottom left corner | string |
+| bottomRight | Border radius for bottom right corner| string |
+
+Each value should be a valid CSS border radius value (e.g., '10px', '1em').
+
+### onChange
+
+Callback function that is called when any border radius value changes.
+
+- **Type:** `Function`
+- **Required:** Yes
+
+The function receives the updated values object as its argument.

packages/block-editor/src/components/border-radius-control/stories/index.story.js

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+/**
+ * WordPress dependencies
+ */
+import { useState } from '@wordpress/element';
+
+/**
+ * Internal dependencies
+ */
+import BorderRadiusControl from '../';
+
+const meta = {
+	title: 'BlockEditor/BorderRadiusControl',
+	component: BorderRadiusControl,
+	parameters: {
+		docs: {
+			canvas: { sourceState: 'shown' },
+			description: {
+				component: 'Control to display border radius options.',
+			},
+		},
+	},
+	argTypes: {
+		values: {
+			control: 'object',
+			description: 'Border radius values.',
+			table: {
+				type: { summary: 'object' },
+			},
+		},
+		onChange: {
+			action: 'onChange',
+			control: { type: null },
+			table: {
+				type: { summary: 'function' },
+			},
+			description: 'Callback to handle onChange.',
+		},
+	},
+};
+
+export default meta;
+
+export const Default = {
+	render: function Template( { onChange, ...args } ) {
+		const [ values, setValues ] = useState( args.values );
+
+		return (
+			<BorderRadiusControl
+				{ ...args }
+				values={ values }
+				onChange={ ( ...changeArgs ) => {
+					setValues( ...changeArgs );
+					onChange( ...changeArgs );
+				} }
+			/>
+		);
+	},
+};