Add placeholder images, enhance alert styles, and implement theme toggle component with dark mode support

resources/js/modules/alerts.js

@@ -0,0 +1,18 @@
+document.addEventListener('DOMContentLoaded', function() {
+    // Get all alert elements
+    const alerts = document.querySelectorAll('.alert');
+    
+    // For each alert
+    alerts.forEach(alert => {
+        // After 5 seconds
+        setTimeout(() => {
+            // Add slideOut animation
+            alert.style.animation = 'slideOut 0.5s ease-out forwards';
+            
+            // Remove the alert after animation completes
+            setTimeout(() => {
+                alert.remove();
+            }, 500);
+        }, 5000);
+    });
+});