CreateTokenForm refactor

Hotovo

CreateTokenForm měl plain input pro name, plain select pro scope, custom red text pro error, custom green border pro success token reveal — nekonzistentní s design systemem. Refactorováno: Input pro name, Select.Root/Trigger/Content/Item pro scope (s triggerLabel $derived), Alert variant=destructive pro error, Alert default pro success s code+copy uvnitř Description.