UI: Added authentic LinkedIn URL to Creator Note

Author: codeXsidd

frontend/src/pages/LoginPage.jsx

@@ -94,7 +94,7 @@ const LoginPage = () => {
                     <p style={{ fontSize: '0.78rem', color: '#94a3b8', fontStyle: 'italic', lineHeight: 1.6, marginTop: 4 }}>
                         "I built StudyTrack because I needed a smarter way to manage my GPA, timetable, and study habits in one place. Built for students, by a student."
                     </p>
-                    <a href="https://linkedin.com/in/YOUR_LINKEDIN_USERNAME" target="_blank" rel="noopener noreferrer" style={{ display: 'flex', alignItems: 'center', gap: '0.6rem', marginTop: 12, textDecoration: 'none', width: 'fit-content' }}>
+                    <a href="https://linkedin.com/in/siddharth2006" target="_blank" rel="noopener noreferrer" style={{ display: 'flex', alignItems: 'center', gap: '0.6rem', marginTop: 12, textDecoration: 'none', width: 'fit-content' }}>
                         <div style={{ width: 28, height: 28, borderRadius: '50%', background: 'linear-gradient(135deg, #6366f1, #8b5cf6)', display: 'flex', alignItems: 'center', justifyContent: 'center', color: 'white', fontSize: '0.75rem', fontWeight: 800 }}>S</div>
                         <div>
                             <p style={{ fontSize: '0.75rem', color: '#e2e8f0', fontWeight: 700, display: 'flex', alignItems: 'center', gap: 4 }}>