Users reported that it's annoying to keep applying the shift occurrence filter
if they switch between weeks. You have to apply the filter, look a the data, go
to the next week, re-apply the same filter, repeat. Especially if they're
flipping back and forth between weeks.
I'm using ActiveModel::Attributes here to ensure we have a attributes method
we can call. It returns a hash that we can plug right into the next/prev week
url params.