feat: Overhauled base template

public/js/navbar.js

@@ -1,3 +1,4 @@
+// Dropdown
 const btn = document.getElementById('navAvatarBtn');
 const dropdown = document.getElementById('navDropdown');
 
@@ -25,3 +26,15 @@ if (btn && dropdown) {
     }
   });
 }
+
+// Theme toggle
+const themeToggle = document.getElementById('themeToggle');
+
+if (themeToggle) {
+  themeToggle.addEventListener('click', () => {
+    const current = document.documentElement.getAttribute('data-theme');
+    const next = current === 'light' ? 'dark' : 'light';
+    document.documentElement.setAttribute('data-theme', next);
+    localStorage.setItem('theme', next);
+  });
+}

public/js/theme.js

@@ -0,0 +1,6 @@
+(function () {
+  const stored = localStorage.getItem('theme');
+  if (stored) {
+    document.documentElement.setAttribute('data-theme', stored);
+  }
+})();