feat: show shopping list items in cards

assets/js/theme.js

@@ -0,0 +1,13 @@
+// Apply saved theme or system preference on load
+if (localStorage.theme === 'dark' || (!localStorage.theme && window.matchMedia('(prefers-color-scheme: dark)').matches)) {
+	document.documentElement.classList.add('dark');
+}
+
+// Theme toggle handler
+document.addEventListener('click', (e) => {
+	if (e.target.closest('[data-theme-switcher]')) {
+		e.preventDefault();
+		const isDark = document.documentElement.classList.toggle('dark');
+		localStorage.theme = isDark ? 'dark' : 'light';
+	}
+});