Fix unit tests: lazy-resolve uuid for Panel models

src/Panel/File.php

@@ -415,7 +415,7 @@ public function props(): array
 				'template'   => $file->template(),
 				'type'       => $file->type(),
 				'url'        => $file->url(),
-				'uuid'       => $file->uuid()?->toString(),
+				'uuid'       => fn () => $file->uuid()?->toString(),
 			],
 			'preview' => [
 				'focusable' => $this->isFocusable(),

src/Panel/Page.php

@@ -358,7 +358,7 @@ public function props(): array
 				'previewUrl' => $page->previewUrl(),
 				'status'     => $page->status(),
 				'title'      => $page->title()->toString(),
-				'uuid'       => $page->uuid()?->toString(),
+				'uuid'       => fn () => $page->uuid()?->toString(),
 			],
 			'status' => function () use ($page) {
 				if ($status = $page->status()) {

src/Panel/Site.php

@@ -86,7 +86,7 @@ public function props(): array
 				'link'       => $this->url(true),
 				'previewUrl' => $this->model->previewUrl(),
 				'title'      => $this->model->title()->toString(),
-				'uuid'       => $this->model->uuid()?->toString(),
+				'uuid'       => fn () => $this->model->uuid()?->toString(),
 			]
 		];
 	}

src/Panel/User.php

@@ -253,7 +253,7 @@ public function props(): array
 				'name'     => $user->name()->toString(),
 				'role'     => $user->role()->title(),
 				'username' => $user->username(),
-				'uuid'     => $user->uuid()?->toString()
+				'uuid'     => fn () => $user->uuid()?->toString()
 			]
 		];
 	}