🛡️ Sentinel: [security improvement]

[Shin5hi]

💡 Vulnerability: Use of legacy onclick property assignment and missing explicit type on a dynamically created button.

🎯 Impact: The onclick property can be easily overwritten by other scripts, and missing type="button" can lead to unintended form submissions if the button is ever placed inside a form element.

🔧 Fix:

1. Replaced closeBtn.onclick = ... with closeBtn.addEventListener('click', ...) for more robust event handling.
2. Explicitly set closeBtn.type = 'button' to ensure consistent behavior.
3. Updated the SHA-256 hash in the Content-Security-Policy meta tag to match the modified inline script, ensuring the security baseline remains intact.

✅ Verification:

• Executed a Playwright verification script that simulated the user journey (clicking the action button, seeing the notification, and closing it).
• Monitored the browser console during verification to ensure NO Content Security Policy (CSP) violations were triggered by the change.
• Verified that functionality remains identical while following security best practices.

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PR created automatically by Jules for task 5327549250561556609 started by @Shin5hi

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