Per review feedback on #3162, move HTML entity decoding from PHP to JavaScript to follow separation of concerns and security best practices.

Changes:

• PHP: Output raw site name via echo $name instead of echo html_entity_decode($name, ENT_QUOTES, 'UTF-8')
• JavaScript: Added decodeHTMLEntities() using DOM-based decoding to safely decode entities while preventing XSS

Implementation:

function decodeHTMLEntities(encodedString: string): string {
	const textarea = document.createElement('textarea');
	textarea.textContent = encodedString;  // Safe assignment, no HTML parsing
	return textarea.innerHTML;              // Returns decoded entities
}

const name = decodeHTMLEntities(response.text.trim());

This approach leverages the browser's native entity decoding without introducing parsing vulnerabilities.

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