feat: integrate Spatie Media Library (#4)

- Added Spatie Media Library
- Added media library configuration file
- Updated Entry model to support media handling
- Added featured image upload with gallery selection and preview
- Added login tests with Dusk for user authentication
- Added Dusk test for featured image selection

Co-authored-by: jon brookes <marshyon@gmail.com>
Reviewed-on: https://codeberg.org/headshed/share-lt/pulls/4

tests/Pest.php

@@ -1,5 +1,9 @@
 <?php
 
+pest()->extend(Tests\DuskTestCase::class)
+//  ->use(Illuminate\Foundation\Testing\DatabaseMigrations::class)
+    ->in('Browser');
+
 /*
 |--------------------------------------------------------------------------
 | Test Case