Refactor ScoreBox to accept ScoreBoxViewState

Ideally `mapToPeriodScores` should be done in the VM, and the `ScoreBox` component as a whole should accept `ScoreBoxViewState` instead of `GameData`. But if you don't want to refactor all of this right now we don't have to. For now, you could just make `toPeriodScores` a function on the `GameData` `data class`.

_Originally posted by @zachseidner1 in https://github.com/cuappdev/score-android/pull/83#discussion_r2370251309_

Start by tracing ScoreBox, ScoreBoxViewState, GameData, mapToPeriodScores, and toPeriodScores through the view model and component. Decide whether the full view-state refactor or the smaller GameData change is intended, then verify that ScoreBox receives the chosen state and period scores still render correctly.

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