Added placeholder users; Better exception handling; Enhanced local setup

database/factories/OrganizationFactory.php

@@ -27,10 +27,10 @@ class OrganizationFactory extends Factory
         ];
     }
 
-    public function withOwner(): self
+    public function withOwner(?User $owner = null): self
     {
         return $this->state(fn (array $attributes) => [
-            'user_id' => User::factory(),
+            'user_id' => $owner === null ? User::factory() : $owner,
         ]);
     }
 }