First commit

static/js/theme.js

@@ -0,0 +1,22 @@
+// Theme toggle — persisted to localStorage
+(function() {
+  const saved = localStorage.getItem('theme') || 'dark';
+  document.documentElement.setAttribute('data-theme', saved);
+})();
+
+function initThemeToggle() {
+  const btn = document.getElementById('theme-toggle');
+  if (!btn) return;
+  function update() {
+    const t = document.documentElement.getAttribute('data-theme');
+    btn.textContent = t === 'dark' ? '☀️' : '🌙';
+  }
+  update();
+  btn.addEventListener('click', () => {
+    const current = document.documentElement.getAttribute('data-theme');
+    const next = current === 'dark' ? 'light' : 'dark';
+    document.documentElement.setAttribute('data-theme', next);
+    localStorage.setItem('theme', next);
+    update();
+  });
+}