[REFACTOR/#212] 온보딩 단계 이동 함수 네이밍 개선 및 null 안전 처리 추가

Author: DongChyeon

core/common/src/main/java/com/yapp/common/navigation/OrbitNavigator.kt

@@ -1,5 +1,6 @@
 package com.yapp.common.navigation
 
+import android.util.Log
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
 import androidx.navigation.NavHostController
@@ -28,12 +29,12 @@ class OrbitNavigator(
     }
 
     fun navigateToOnboardingNextStep(currentStep: Int, navOptions: NavOptions? = null) {
-        val nextRouteClass = OnboardingDestination.nextRoute(currentStep + 1) ?: return
-
-        val nextRouteInstance = nextRouteClass.objectInstance
-            ?: error("Cannot get object instance of route class: $nextRouteClass")
-
-        navController.navigate(nextRouteInstance, navOptions)
+        val instance = OnboardingDestination.getNextRouteForStep(currentStep)?.objectInstance
+        if (instance != null) {
+            navController.navigate(instance, navOptions)
+        } else {
+            Log.e("Navigator", "Invalid route at step: $currentStep")
+        }
     }
 
     fun navigateToAddAlarm(navOptions: NavOptions? = null) {

core/common/src/main/java/com/yapp/common/navigation/route/OnboardingRoute.kt

@@ -47,8 +47,8 @@ sealed class OnboardingDestination {
             Complete2::class,
         )
 
-        fun nextRoute(currentStep: Int): KClass<out OnboardingDestination>? {
-            val nextRoute = routes.getOrNull(currentStep)
+        fun getNextRouteForStep(currentStep: Int): KClass<out OnboardingDestination>? {
+            val nextRoute = routes.getOrNull(currentStep + 1)
             return nextRoute
         }
     }

feature/onboarding/src/main/java/com/yapp/onboarding/OnboardingViewModel.kt

@@ -96,7 +96,7 @@ class OnboardingViewModel @Inject constructor(
     private fun moveToNextStep() {
         val currentStep = container.stateFlow.value.currentStep
         val nextStep = currentStep + 1
-        val nextRoute = OnboardingDestination.nextRoute(currentStep)
+        val nextRoute = OnboardingDestination.getNextRouteForStep(currentStep)
 
         savedStateHandle["birthDate"] = currentState.birthDate
         savedStateHandle["birthType"] = currentState.birthType