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48ac9a9019
Refactored the application's multi-tab navigation to strictly align with the official AndroidX `nav3-recipes` for multiple backstacks. Previously, swapping a single `NavBackStack` list instance caused Navigation 3 to perceive old entries as "popped," leading to the destruction of their associated `ViewModelStore` and UI state. This commit resolves the issue by: - Redesigning `MultiBackstack` as a state holder managing independent `NavBackStack` instances per tab. - Modifying `MeshtasticNavDisplay` to bind a fresh set of decorators (specifically `SaveableStateHolderNavEntryDecorator` and `ViewModelStoreNavEntryDecorator`) to the active backstack dynamically via `remember(backStack)`. This ensures decorators are swapped alongside the stack, preserving state for inactive tabs. - Implementing the standard "exit through home" back-handling pattern across all platforms. - Removing legacy manual string keys from `koinViewModel()` injections, as `ViewModelStoreNavEntryDecorator` now correctly isolates ViewModel scope per entry. - Added `androidx.lifecycle.viewmodel.navigation3` dependencies to the `app` and `desktop` root modules to support the decorator injections at the root composition level.