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

composer.json

@@ -8,14 +8,17 @@
     "require": {
         "php": "^8.2",
         "filament/filament": "^4.0",
+        "filament/spatie-laravel-media-library-plugin": "^4.4",
         "laravel/fortify": "^1.30",
         "laravel/framework": "^12.0",
         "laravel/tinker": "^2.10.1",
-        "livewire/flux": "^2.9.0"
+        "livewire/flux": "^2.9.0",
+        "spatie/laravel-medialibrary": "^11.17"
     },
     "require-dev": {
         "fakerphp/faker": "^1.23",
         "laravel/boost": "^1.8",
+        "laravel/dusk": "^8.3",
         "laravel/pail": "^1.2.2",
         "laravel/pint": "^1.24",
         "laravel/sail": "^1.41",