fix: Mark label as selected when programatically calling `selectCategory()`

When we called selectCategory() before this PR, the labels on the left-hand side of the screen did not get updated correctly. The de-selection was performed but the selection was not visible.

Now, when you selectCategory() the selection is visible, as well as the de-selection like before.

Since selectCategory() is public API, I feel like this is an important change to make :^)