fix: map render not working with covid map

Closes MIN-186

Issue identified:

Map render is not working, thrown error tells that "mapSize" is not updated properly (there are still default values)

Source of the issue:

1. authors field can be an array of strings of array of objects
2. authors field was defined as string[] only, so zod validator rejected the whole API response
3. As API response was rejected, mapSize couldn't be updated properly

Additional fixes:

• there were issues with import of PinType, so I've fixed it here. It probably comes from merge error