fix(ui): Determine start destination before composing backstack

Check onboarding state in MainActivity before creating the NavBackStack,
so the correct screen is shown from the first frame. Removes the
redundant async check from OverviewViewModel that caused the dashboard
to briefly flash before redirecting to onboarding on fresh installs.

app/src/main/java/eu/darken/capod/main/ui/MainActivity.kt

@@ -18,6 +18,7 @@ import eu.darken.capod.common.navigation.NavigationController
 import eu.darken.capod.common.navigation.NavigationEntry
 import eu.darken.capod.common.theming.CapodTheme
 import eu.darken.capod.common.uix.Activity2
+import eu.darken.capod.main.core.GeneralSettings
 import javax.inject.Inject
 
 @AndroidEntryPoint
@@ -25,14 +26,21 @@ class MainActivity : Activity2() {
 
     @Inject lateinit var navCtrl: NavigationController
     @Inject lateinit var navigationEntries: Set<@JvmSuppressWildcards NavigationEntry>
+    @Inject lateinit var generalSettings: GeneralSettings
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         installSplashScreen()
         enableEdgeToEdge()
 
+        val startDestination: NavKey = if (generalSettings.isOnboardingDone.value) {
+            Nav.Main.Overview
+        } else {
+            Nav.Main.Onboarding
+        }
+
         setContent {
-            val backStack = rememberNavBackStack(Nav.Main.Overview)
+            val backStack = rememberNavBackStack(startDestination)
             navCtrl.setup(backStack)
 
             CapodTheme {

app/src/main/java/eu/darken/capod/main/ui/overview/OverviewViewModel.kt

@@ -49,12 +49,6 @@ class OverviewViewModel @Inject constructor(
     private val profilesRepo: DeviceProfilesRepo,
 ) : ViewModel4(dispatcherProvider) {
 
-    init {
-        if (!generalSettings.isOnboardingDone.value) {
-            navTo(Nav.Main.Onboarding, popUpTo = Nav.Main.Overview, inclusive = true)
-        }
-    }
-
     val requestPermissionEvent = SingleEventFlow<Permission>()
     val launchUpgradeFlow = SingleEventFlow<(Activity) -> Unit>()