Storybook: Add stories for DateFormatPicker Component

packages/block-editor/src/components/date-format-picker/stories/index.story.js

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+/**
+ * Internal dependencies
+ */
+import DateFormatPicker from '..';
+
+/**
+ * WordPress dependencies
+ */
+import { useEffect, useState } from '@wordpress/element';
+
+/**
+ * Date format options
+ */
+const FORMAT_OPTIONS = [
+	null,
+	'Y-m-d',
+	'n/j/Y',
+	'n/j/Y g:i A',
+	'M j, Y',
+	'M j, Y g:i A',
+	'F j, Y',
+	'M j',
+];
+
+/**
+ * Storybook configuration for DateFormatPicker component
+ */
+export default {
+	title: 'BlockEditor/DateFormatPicker',
+	component: DateFormatPicker,
+	argTypes: {
+		defaultFormat: {
+			control: 'text',
+			description: 'Default date format to display',
+		},
+		format: {
+			control: 'select',
+			options: FORMAT_OPTIONS,
+			description: 'Selected date format',
+		},
+		onChange: {
+			action: 'onChange',
+			control: {
+				type: null,
+			},
+			description: 'Callback function when date format changes',
+		},
+	},
+	render: function Render( { onChange, format, defaultFormat } ) {
+		const [ selectedFormat, setSelectedFormat ] = useState( format );
+
+		useEffect( () => {
+			setSelectedFormat( format );
+		}, [ format ] );
+
+		const handleFormatChange = ( newValue ) => {
+			setSelectedFormat( newValue );
+			if ( onChange ) {
+				onChange( newValue );
+			}
+		};
+
+		return (
+			<DateFormatPicker
+				defaultFormat={ defaultFormat }
+				format={ selectedFormat }
+				onChange={ handleFormatChange }
+			/>
+		);
+	},
+};
+
+/**
+ * Story demonstrating DateFormatPicker with default settings
+ */
+export const Default = {
+	args: {
+		defaultFormat: 'M j, Y',
+		format: 'Y-m-d',
+	},
+};
+
+/**
+ * DateFormatPicker with format set to null and defaultFormat set to 'M j, Y'
+ */
+export const WithFormatNull = {
+	args: {
+		defaultFormat: 'M j, Y',
+		format: null,
+	},
+};
+
+/**
+ * DateFormatPicker with defaultFormat set to empty string and format set to 'Y-m-d'
+ */
+export const WithDefaultFormatEmpty = {
+	args: {
+		defaultFormat: '',
+		format: 'Y-m-d',
+	},
+};