feat: Theme toggle with localStorage persistence

wwwroot/js/admin.js

@@ -1,7 +1,46 @@
 // === Scratching Post Admin JS ===
+
+// === Theme Toggle ===
+(function () {
+    var saved = localStorage.getItem('sb-theme') || 'dark';
+    document.documentElement.setAttribute('data-theme', saved);
+
+    document.addEventListener('DOMContentLoaded', function () {
+        updateToggleIcon(saved);
+
+        var btn = document.getElementById('themeToggle');
+        if (btn) {
+            btn.addEventListener('click', function () {
+                var current = document.documentElement.getAttribute('data-theme') || 'dark';
+                var next = current === 'dark' ? 'light' : 'dark';
+                document.documentElement.setAttribute('data-theme', next);
+                localStorage.setItem('sb-theme', next);
+                updateToggleIcon(next);
+            });
+        }
+    });
+
+    function updateToggleIcon(theme) {
+        var btn = document.getElementById('themeToggle');
+        if (!btn) return;
+        btn.innerHTML = theme === 'dark'
+            ? '<i class="bi bi-sun"></i>'
+            : '<i class="bi bi-moon-stars"></i>';
+        btn.title = theme === 'dark' ? 'Switch to Light Mode' : 'Switch to Dark Mode';
+    }
+})();
+
+// Auto-dismiss alerts after 5 seconds
 document.querySelectorAll('.alert-dismissible').forEach(function (alert) {
-    setTimeout(function () { var bsAlert = bootstrap.Alert.getOrCreateInstance(alert); bsAlert.close(); }, 5000);
+    setTimeout(function () {
+        var bsAlert = bootstrap.Alert.getOrCreateInstance(alert);
+        bsAlert.close();
+    }, 5000);
 });
+
+// Confirm dangerous actions
 document.querySelectorAll('[data-confirm]').forEach(function (el) {
-    el.addEventListener('click', function (e) { if (!confirm(this.dataset.confirm)) e.preventDefault(); });
+    el.addEventListener('click', function (e) {
+        if (!confirm(this.dataset.confirm)) e.preventDefault();
+    });
 });