Add VaultTakeover navigation

Create VaultTakeoverNavigation with type-safe routing:

- VaultTakeoverRoute: Serializable data object for type-safe navigation
- navigateToVaultTakeover(): NavController extension for navigation
- vaultTakeoverDestination(): NavGraphBuilder extension to register screen

Uses composableWithSlideTransitions for consistent navigation animations.
Follows established navigation patterns in the codebase.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/src/main/kotlin/com/x8bit/bitwarden/ui/vault/feature/vaulttakeover/VaultTakeoverNavigation.kt

@@ -0,0 +1,35 @@
+package com.x8bit.bitwarden.ui.vault.feature.vaulttakeover
+
+import androidx.navigation.NavController
+import androidx.navigation.NavGraphBuilder
+import androidx.navigation.NavOptions
+import com.bitwarden.ui.platform.base.util.composableWithSlideTransitions
+import kotlinx.serialization.Serializable
+
+/**
+ * The type-safe route for the vault takeover screen.
+ */
+@Serializable
+data object VaultTakeoverRoute
+
+/**
+ * Navigate to the vault takeover screen.
+ */
+fun NavController.navigateToVaultTakeover(navOptions: NavOptions? = null) {
+    this.navigate(route = VaultTakeoverRoute, navOptions = navOptions)
+}
+
+/**
+ * Add the vault takeover screen to the nav graph.
+ */
+fun NavGraphBuilder.vaultTakeoverDestination(
+    onNavigateToVault: () -> Unit,
+    onNavigateToLeaveOrganization: () -> Unit,
+) {
+    composableWithSlideTransitions<VaultTakeoverRoute> {
+        VaultTakeoverScreen(
+            onNavigateToVault = onNavigateToVault,
+            onNavigateToLeaveOrganization = onNavigateToLeaveOrganization,
+        )
+    }
+}