Improve retrieving ViewModels

[mlykotom]

• using LocalAppContainer to retrieve the DI graph instead of getting it with Android Context
• AppContainer provides the viewModel factories
• extras is only used for the FruittieViewModel to pass the fruittieId
• did some small renaming alongside

Although I think we could improve it by providing the initializer directly in the AppContainer and get rid of using the CreationExtras at all, I think it's a good way to show how to use it from Swift code.

[gemini-code-assist]

Summary of Changes

Hello @mlykotom, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant architectural improvement by refactoring how ViewModels are retrieved and instantiated across both Android and iOS platforms in this Kotlin Multiplatform project. The core change involves centralizing ViewModel factory definitions within the AppContainer and providing a more idiomatic way to access these factories, particularly through the introduction of LocalAppContainer for Android Compose. This approach streamlines dependency injection, moves away from direct Android Context access for DI, and reduces boilerplate in individual ViewModel classes, leading to a cleaner and more maintainable codebase.

Highlights

• Centralized ViewModel Factories: I've refactored the AppContainer to directly expose ViewModelProvider.Factory instances for MainViewModel, CartViewModel, and FruittieViewModel. This centralizes the ViewModel creation logic within the dependency injection graph.
• Simplified ViewModel Instantiation: ViewModel instantiation in Android Compose and iOS SwiftUI has been simplified. Instead of manually retrieving the AppContainer and passing it to a generic creationExtras helper, ViewModels are now created directly using the factories provided by LocalAppContainer.current (on Android) or appContainer.value (on iOS).
• LocalAppContainer for Android Compose: A new LocalAppContainer CompositionLocal has been introduced in the Android application. This allows Composables to easily access the AppContainer instance without relying on the Android Context, improving testability and separation of concerns.
• Reduced ViewModel Boilerplate: The individual ViewModel classes (CartViewModel, FruittieViewModel, MainViewModel) no longer define their own Factory companion objects, as their creation is now managed by the AppContainer.
• Refactored ViewModelFactory Helper: The ViewModelFactory.kt file has been significantly simplified, removing the custom fruittiesViewModelFactory and APP_CONTAINER_KEY as they are no longer needed with the new centralized factory approach. The creationExtras function is now a more generic helper for passing additional data.
• Renaming and Package Restructuring: Several classes and packages have been renamed or moved for better organization, including the main Android Application class (App to FruittiesAndroidApp) and the Android theme file (MyApplicationTheme to FruittiesTheme).

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[gemini-code-assist]

Code Review

This pull request centralizes ViewModel creation and improves dependency injection using LocalAppContainer on Android, and moves ViewModel factories into the AppContainer, simplifying the UI layer on both Android and iOS. Suggestions have been made to improve robustness and correctness.

[cartland]

Code Assist found a place with a high risk of introducing a bug, so it makes sense to add a key parameter. I also think we should add a comment to the initializer block that uses get(KEY).