Replace direct `navigation.navigate()` and `navigation.getParent()?.navigate()` calls with centralized `navigationService.navigate()` across multiple screens. Convert screen component functions from JSX elements to array-returning functions in RootNavigator to fix React key warnings and improve render consistency.
- HomeScreen: use navigationService for post and user navigation
- PrivateChatInfoScreen: use navigationService for profile navigation
- ChatScreen: use navigationService for avatar press and user profile navigation
- RootNavigator: convert PublicScreens and AuthenticatedScreens to getPublicScreens() and getAuthenticatedScreens() functions returning arrays with proper keys
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