(Supernova): Delete all unnecessary parsers in Zustand.

[TilmanHaupt]

Review the Zustand store and identify functions that perform unnecessary type checking due to TypeScript's built-in type safety. Remove redundant type-checking functions and any associated logic that is no longer needed to streamline the code. Ensure the refactored code remains functional and maintainable.

• delete all unnecessary parseX functions
• delete all unnecessary validateX functions
• check all anys if they can be deleted
• ensure all slices are typed with interfaces

[edda]

Please keep in mind that most of the content of the store is data that was fetched via API. So in many cases we'll probably need to keep the validators and checkers because there is no TypeScript type safety at runtime.