🔒 Fix DOM-Based XSS via innerHTML

[LVT-ENG]

🎯 What: Replaced vulnerable innerHTML usage with safe DOM manipulation methods (document.createElement and textContent) when creating the confirmation overlay.

⚠️ Risk: Using innerHTML introduces a DOM-based Cross-Site Scripting (XSS) vulnerability, which could allow malicious scripts to be executed within the context of the user's browser, potentially compromising their data or session.

🛡️ Solution: The overlay container and its heading are now constructed securely using document.createElement. The text content is safely injected using textContent, mitigating the risk of XSS.

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PR created automatically by Jules for task 16721668505767198098 started by @LVT-ENG

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