Default Track Settings & Unify VideoPlayerSettingsView

[JPKribs]

Summary

Resolves: #1068

Because of how #1581 configured it, we are already pulling the default track selection based on the UserDto.UserConfiguration settings that we get from the server. This PR just adds a new setting to update these values from Swiftfin instead of relying on folks changing this from Jellyfin-Web:

Settings > Playback > Audio Settings

Settings > Subtitles > Subtitles

This PR also fully refactors VideoPlayerSettingsView to be platform agnostic.

This PR also migrates ServerUserAdminViewModel to stateful and cleans up the views that use this. Most of these are a straight change but some of these there was some additional cleanup. The 3 big cleanups were reducing the comments that I originally put in there, combining vars when they were needlessly split up (by me), and finally, removing duplicate deletion logic.

Finally, this PR uses the same ServerUserAdminViewModel to track other server settings as well:

• isHidePlayedInLatest | Home View
• isDisplayMissingEpisodes | Item View for Seasons
• enableNextEpisodeAutoPlay | Player UI + Video Player Settings

These are items we had defaults / stored values for but most clients just pull this from the user configuration of the user session. This migrates these to use the user session > user configuration and updates the callers for these defaults / stored values to instead using the user session > user configuration.

Videos

Swiftfin to Web Sync

Screen.Recording.2026-03-01.at.12.31.53.mov

tvOS

Simulator.Screen.Recording.-.Apple.TV.-.2026-02-27.at.17.18.25.mov

iOS

Simulator.Screen.Recording.-.iPhone.-.2026-02-27.at.17.22.16.mov

[JPKribs]

This PR is done but there is a lot of localizing. I also touch this same place via other outstanding PRs. When those are closed, I will finish up the localization and finalize this one. Videos are up-to-date!

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Edit: Looks like I should do the same with the the days in next up and Enable Rewatching in Next Up to sync those with other clients / web. I will make that it's own PR. The changes here are somewhere more targeted but that change should be simple on top of this.