refactor: NowPlaying and TuneIn viewModels

[gsalinaslopez]

Changes

• NowPlaying screen refactoring to pass server ip with @Assisted hilt injection from NavHost
• Move snapclient service and snapcast control initialization from tuneIn into nowPlaying viewModels

Passing values to a viewModel using navigation reference: https://github.com/android/nav3-recipes/tree/main#passing-navigation-arguments-to-viewmodels

[garpernica]

Great improvement switching to a data class for NowPlaying nav key enables parameterized routing—much better than hardcoded values.
The Hilt-assisted ViewModel creation is spot-on.
Consider adding a comment above the nav entry explaining the serverIp extraction for future maintainers
It's good you removed the empty onUnbind —dead code gone.