Feat: 인트로, 스플래시 화면 경로 추가

- MainNavigator 시작 화면 Splash로 변경
- SplashScreenContainer, IntroScreenContainer 라우팅 설정

Author: wjdrjs00

app/src/main/java/com/threegap/bitnagil/MainNavHost.kt

@@ -5,7 +5,9 @@ import androidx.compose.ui.Modifier
 import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
 import com.threegap.bitnagil.presentation.home.HomeScreen
+import com.threegap.bitnagil.presentation.intro.IntroScreenContainer
 import com.threegap.bitnagil.presentation.login.LoginScreenContainer
+import com.threegap.bitnagil.presentation.splash.SplashScreenContainer
 
 @Composable
 fun MainNavHost(
@@ -17,6 +19,17 @@ fun MainNavHost(
         startDestination = navigator.startDestination,
         modifier = modifier,
     ) {
+        composable<Route.Splash> {
+            SplashScreenContainer(
+                navigateToIntro = { navigator.navController.navigate(Route.Intro) },
+                navigateToHome = { navigator.navController.navigate(Route.Home) },
+            )
+        }
+
+        composable<Route.Intro> {
+            IntroScreenContainer()
+        }
+
         composable<Route.Login> {
             LoginScreenContainer()
         }

app/src/main/java/com/threegap/bitnagil/MainNavigator.kt

@@ -8,7 +8,7 @@ import androidx.navigation.compose.rememberNavController
 class MainNavigator(
     val navController: NavHostController,
 ) {
-    val startDestination = Route.Login
+    val startDestination = Route.Splash
 }
 
 @Composable

app/src/main/java/com/threegap/bitnagil/Route.kt

@@ -4,6 +4,12 @@ import kotlinx.serialization.Serializable
 
 @Serializable
 sealed interface Route {
+    @Serializable
+    data object Splash : Route
+
+    @Serializable
+    data object Intro : Route
+
     @Serializable
     data object Login : Route