I don't have experience with Nova but I understand your error message, the class
WelcomeCard from namespace
Pt1App\WelcomeCard can't be found.
If I read Defining Cards from the Nova documentation. I see that it should have updated the path repository part of you composer.json file. Did you see it there?
If it is there you can run
composer dump-autoload to update your autoloader so it can find the class.
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