Bug #4808: Navigation sidebar closes on item selection for narrower screens

[Zaki-Mohd]

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Summary

This PR addresses Bug #4808. The navigation sidebar now automatically closes when a user selects an item while the sidebar is in a collapsible state.

What was done

• Added an event listener for navigation item selection.
• Triggered sidebar collapse programmatically on selection.
• Verified locally on Node 22 + Yarn 4; sidebar closes correctly after item selection.

Related issue

Fixes #4808

Testing

• Confirmed sidebar closes after selection.
• HMR and other sidebar behaviors remain functional.

Notes

No changes to wider-screen behavior; the fix only applies when the sidebar is collapsible.