fix(splash): navigate to the first screen once

The splash screen asks for the initial destination on every onResume, which
runs again when the activity is recreated during startup while the view model
survives. The second navigation found the first already on the welcome screen,
with no route from there, and crashed the app with 'Unknown case for
welcomeFragment'. The view model now starts it once.

feature-splash/src/main/java/io/novafoundation/nova/splash/presentation/SplashViewModel.kt

@@ -5,6 +5,7 @@ import io.novafoundation.nova.common.base.BaseViewModel
 import io.novafoundation.nova.common.utils.splash.SplashPassedObserver
 import io.novafoundation.nova.feature_account_api.domain.interfaces.AccountRepository
 import io.novafoundation.nova.splash.SplashRouter
+import kotlinx.coroutines.Job
 import kotlinx.coroutines.launch
 
 class SplashViewModel(
@@ -13,8 +14,16 @@ class SplashViewModel(
     private val splashPassedObserver: SplashPassedObserver
 ) : BaseViewModel() {
 
+    private var initialDestinationJob: Job? = null
+
+    // Called from the splash screen's onResume, which runs again when the activity is
+    // recreated (rotation, theme, locale) while this view model survives. Starting a
+    // second navigation then finds the first one already on the welcome screen, which
+    // has no route to welcome, and crashes the app. The first call decides.
     fun openInitialDestination() {
-        viewModelScope.launch {
+        if (initialDestinationJob != null) return
+
+        initialDestinationJob = viewModelScope.launch {
             if (repository.isAccountSelected()) {
                 openPinCode()
             } else {