feat: Initial commit

public/js/navbar.js

@@ -0,0 +1,27 @@
+const btn = document.getElementById('navAvatarBtn');
+const dropdown = document.getElementById('navDropdown');
+
+if (btn && dropdown) {
+  btn.addEventListener('click', (e) => {
+    e.stopPropagation();
+    const isOpen = dropdown.classList.toggle('open');
+    btn.setAttribute('aria-expanded', isOpen);
+    dropdown.setAttribute('aria-hidden', !isOpen);
+  });
+
+  document.addEventListener('click', () => {
+    dropdown.classList.remove('open');
+    btn.setAttribute('aria-expanded', false);
+    dropdown.setAttribute('aria-hidden', true);
+  });
+
+  dropdown.addEventListener('click', (e) => e.stopPropagation());
+
+  document.addEventListener('keydown', (e) => {
+    if (e.key === 'Escape') {
+      dropdown.classList.remove('open');
+      btn.setAttribute('aria-expanded', false);
+      btn.focus();
+    }
+  });
+}