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/Browser/Concerns/AuthenticatesUsers.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Tests\Browser\Concerns;
+
+use App\Models\User;
+use Laravel\Dusk\Browser;
+
+trait AuthenticatesUsers
+{
+    private function createTestUser(string $email): User
+    {
+        return User::factory()->create([
+            'email' => $email,
+            'password' => bcrypt('password'),
+            'two_factor_secret' => null,
+            'two_factor_recovery_codes' => null,
+        ]);
+    }
+
+    private function loginUser(Browser $browser, User $user): void
+    {
+        $browser->visit('/login')
+            ->type('email', $user->email)
+            ->type('password', 'password')
+            ->press('Log in')
+            ->waitForLocation('/dashboard');
+    }
+    
+    private function assertWithDebugPause(Browser $browser, callable $assertions, int $pauseMs = 10000): void
+    {
+        try {
+            $assertions($browser);
+        } catch (\Exception $e) {
+            $browser->pause($pauseMs);
+            throw $e;
+        }
+    }
+}