Fix Bootstrap light/dark theming across all layouts

- Make dark mode toggle reactive using Alpine x-data theme property
- Apply saved theme on page load via data-bs-theme attribute binding
- Remove hardcoded bg-light classes that broke dark mode styling
- Fix duplicate/broken Bootstrap bundle import in app.js

resources/views/livewire/auth/login.blade.php

@@ -29,7 +29,7 @@ new #[Layout('components.layouts.guest')] class extends Component {
 }
 ?>
 
-<div class="min-vh-100 d-flex align-items-center justify-content-center bg-light">
+<div class="min-vh-100 d-flex align-items-center justify-content-center">
     <div class="card shadow-sm" style="width: 100%; max-width: 420px;">
         <div class="card-body p-4">
             <div class="text-center mb-4">