Better rename UI

[SirSeim]

Reviewing with users, a couple things came up about edit-ability:

• Original name fields are helpful, but not clear they are not editable in comparison to title and year fields that are
• File picker wasn't obviously editable
• On summary page, not clear final name is editable
  • maybe we don't really need this for movies
• subtitle section having white backgrounded "None" is fine since it's separate
• Should have "Delete Untouched Files" toggle defaulted on
  • list of those files should not denote edit-ability, just the toggle

[SirSeim]

More ideas:

• No need for separate Movie or TV show picker screen, use a menu item that pops up when hitting start rename
  • This also means all the rename navigation can be collapsed into a single detail view. Should help NavigationSplitView to better understand what is going on with the current state. Can still have separate view structs to maintain separation of concerns, but they'll ultimately tie back to the same navigation view.
• Some kind of flow should enable going back and forth between the primary rename screen and the summary view. Maybe a back button, maybe a toggle state.
• Make it easier and more clear how to exit the rename flow without performing any actions. It should get you back to the plain detail view of the addition you were renaming.