[WIP] [tvOS] Letter Picker

[JPKribs]

Summary

Takes the same logic from the LetterPickerBar on iOS and implements it to tvOS.

Image

Video

Simulator.Screen.Recording.-.Apple.TV.4K.3rd.generation.-.2024-08-09.at.14.04.40.mp4

Outstanding Issues

1. On Main, tvOS PagingScrollViews jump their focus to the top of the page whenever a new page of data is loaded. Since the Letter Picker is the tallest item, this is now capturing the focus. I think this is more of an issue with the PagingLibraryView and knocking out that TODO. (I tried but I couldn't get figure it out)
2. If you are hovering a letter that is above, below, or between posters, it cannot jump to them. Instead, you have to go back up to a letter that in even to a poster to move the cursor back to the posters.
3. This only works where there are filterViewModels. This means the MainTab Movies/TV Shows cannot have a Letter Picker on them. Only items in Media section can have it. I didn't want to dig too far into adding FilterViewModels to the ItemTypeLibraries. Partially because I'm not sure how but also do we want the Item Types to have filters on them?

Outstanding Discussions

• I made the letters white with a shadow for visibility. Let me know if there are any issues with this.
• Since I am able to re-use the LetterPickerBar, I moved this to Shared but the LetterPickerButtons are OS specific. Let me know if it would be better to have a separate bar per OS.

[LePips]

I won't be looking at tvOS for a bit and will have to think about the design and interaction of this.