fix: dynamic copyright year with founding year logic

Updated footer copyright to display founding year (2026) dynamically.
- Shows "© 2026" in founding year instead of "© 2026–2026"
- Automatically appends current year as "© 2026–YYYY" in future years
- No manual updates required going forward

Author: er-mayanka

index.html

@@ -1159,7 +1159,7 @@ <h2>Help build the future<br/>of <span style="color:var(--cyan)">mobile computin
       <a href="https://zethraos.com">zethraos.com</a>
     </div>
     <div class="footer-copy">
-      © 2025 ZethraOS · Built on Linux 6.x · Apache 2.0 · Made with <span>♥</span> for the open source community
+      © 2026<span id="current-year"></span> ZethraOS · Built on Linux 6.x · Apache 2.0 · Made with <span>♥</span> for the open source community
     </div>
   </div>
 </footer>
@@ -1278,6 +1278,10 @@ <h2>Help build the future<br/>of <span style="color:var(--cyan)">mobile computin
     }
     draw();
   })();
+
+  const founded = 2026;
+  const current = new Date().getFullYear();
+  document.getElementById('current-year').textContent = current > founded ? `–${current}` : '';
 </script>
 </body>
 </html>