Update extra.js

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhanced theme handling for the Ultralytics Handbook, improving responsiveness to system and user preferences. 🌓

📊 Key Changes

• Modularized the theme application logic by introducing an applyTheme function to improve code readability.
• Adjusted event listener syntax for monitoring system theme preference changes.
• Improved code formatting and consistency in string literals (using double quotes).

🎯 Purpose & Impact

• Improved Code Maintainability: By encapsulating theme logic in a function, the code is easier to read and maintain.
• Enhanced User Experience: The app now more reliably switches themes based on user preference or system settings, providing a seamless visual experience.
• Consistent Styling: Ensures more consistent styling throughout the documentation by adhering to the set color scheme.

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Name	Status	Preview	Comments	Updated (UTC)
handbook	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 21, 2024 11:37pm

[UltralyticsAssistant]

👋 Hello @glenn-jocher, thank you for submitting an ultralytics/handbook 🚀 PR! This is an automated response that will be followed by assistance from an Ultralytics engineer soon. To ensure a seamless integration of your contribution, please review the checklist below:

• ✅ Define a Purpose: Ensure your PR clearly states the purpose of your changes, and link to any relevant issues. Make sure your commit messages are clear and adhere to our project's conventions.
• ✅ Synchronize with Source: Confirm your branch is up to date with the main branch of the repository. Update it by clicking the 'Update branch' button or by running git pull and git merge main locally to avoid conflicts.
• ✅ Ensure CI Checks Pass: Verify that all Ultralytics Continuous Integration (CI) checks are passing. Please address any failing checks to ensure a smooth review process.
• ✅ Update Documentation: If your changes affect the project documentation, make sure to update the relevant sections in the documentation.
• ✅ Add Tests: Include or update tests to cover your changes and ensure that they pass successfully.
• ✅ Sign the CLA: If this is your first contribution to Ultralytics, please sign the Contributor License Agreement by commenting "I have read the CLA Document and I sign the CLA" below.
• ✅ Minimize Changes: Focus your modifications on the essential parts needed for your bug fix or feature implementation. A wise reminder from Bruce Lee: "It is not daily increase but daily decrease, hack away the unessential."

For more information, check our Contributing Guide. Feel free to leave a comment if you have questions or need further assistance. Thank you for enhancing the Ultralytics project! 🌟