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

app/Livewire/MobileMenuComponent.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Livewire;
+
+use Livewire\Component;
+
+class MobileMenuComponent extends Component
+{
+    public bool $isOpen = false;
+
+    public function toggle()
+    {
+        $this->isOpen = !$this->isOpen;
+    }
+
+    public function render()
+    {
+        return view('livewire.mobile-menu-component');
+    }
+}