StoryBook: Add story for observe-typing

packages/block-editor/src/components/observe-typing/stories/index.story.js

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+/**
+ * WordPress dependencies
+ */
+import { useState } from '@wordpress/element';
+
+/**
+ * Internal dependencies
+ */
+import ObserveTyping from '../index.js';
+
+const meta = {
+	title: 'BlockEditor/ObserveTyping',
+	component: ObserveTyping,
+	parameters: {
+		docs: {
+			canvas: { sourceState: 'shown' },
+			description: {
+				component:
+					'A component that observes typing events and manages the typing flag in the editor.',
+			},
+		},
+	},
+	argTypes: {
+		children: {
+			control: 'text',
+			description: 'Content wrapped by the ObserveTyping component.',
+			table: {
+				type: { summary: 'ReactNode' },
+			},
+		},
+	},
+};
+
+export default meta;
+
+export const Default = {
+	render: function Template( { children, ...args } ) {
+		const [ isTyping, setIsTyping ] = useState( false );
+
+		const onTypingStart = () => setIsTyping( true );
+		const onTypingStop = () => setIsTyping( false );
+
+		return (
+			<ObserveTyping { ...args }>
+				<div>
+					<p>{ isTyping ? 'Typing...' : 'Not typing' }</p>
+					<input
+						type="text"
+						onFocus={ onTypingStart }
+						onBlur={ onTypingStop }
+					/>
+				</div>
+			</ObserveTyping>
+		);
+	},
+	args: {
+		children: 'This is the area where typing will be observed.',
+	},
+};