Default Bootstrap theme to dark mode

- Change default theme from light to dark for first-time visitors
- Fix Alpine reactive theme toggle so icons and data-bs-theme update correctly
- Remove hardcoded bg-light classes that prevented dark mode from applying
- Fix broken duplicate Bootstrap bundle import in app.js

resources/js/app.js

@@ -1,4 +1,3 @@
 import * as bootstrap from 'bootstrap';
-import './../../node_modules/bootstrap/dist/js/bootstrap.bundle.min.js';
 
 window.bootstrap = bootstrap;