docs: Add long polling example

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Adds a new interactive example demonstrating how to implement long polling in Vue. The example polls the GitHub API for Vue Core commits every 3 seconds, with controls to start/stop polling and proper cleanup on unmount. Includes both Composition API and Options API versions.

Trigger Events

Web UI: Can you add a page to the docs with an example of building a...

Agent Response

I've created a new long polling example for the Vue.js documentation. Here's what was added:

New Example: Long Polling

The example demonstrates how to implement long polling in Vue by periodically fetching data from an API. It includes:

Features:

• Polls the GitHub API for the latest Vue Core commits every 3 seconds
• Start/stop controls so users can see the polling behavior
• Displays the last update timestamp
• Proper cleanup by stopping the interval when the component unmounts

Files Created:

• description.txt - Brief description of what the example demonstrates
• App/template.html - The UI with a toggle button, status indicator, and commit list
• App/composition.js - Implementation using the Composition API (ref, onUnmounted)
• App/options.js - Implementation using the Options API (data, methods, beforeUnmount)
• App/style.css - Styling for the button and commit list

The example follows the same structure as existing examples like fetching-data, so it will automatically appear in the Examples section of the docs with support for both API styles.

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