chore: improve code quality - PHPStan level 5, add #[\Override] attributes, fix return types

app/Models/SocialAccount.php

@@ -7,8 +7,10 @@ use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 class SocialAccount extends Model
 {
+    #[\Override]
     protected $table = 'social_accounts';
 
+    #[\Override]
     protected $fillable = [
         'user_id',
         'provider',