feat: extract detail arguments from saved state handle

- Extract `id` and `image` from `savedStateHandle` using `toRoute()` instead of lazy initialization
- Removed unused `Detail` object creation and its corresponding code
- Replaced the `lazy { ... }` block with a single line of code to initialize the `args` variable directly

Author: shinhyo

feature/detail/src/main/kotlin/io/github/shinhyo/brba/feature/detail/DetailViewModel.kt

@@ -18,6 +18,7 @@ package io.github.shinhyo.brba.feature.detail
 import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import androidx.navigation.toRoute
 import dagger.hilt.android.lifecycle.HiltViewModel
 import io.github.shinhyo.brba.core.common.result.Result
 import io.github.shinhyo.brba.core.common.result.asResult
@@ -47,12 +48,7 @@ class DetailViewModel @Inject constructor(
     private val updateFavoriteUseCase: UpdateFavoriteUseCase,
 ) : ViewModel() {
 
-    private val args: Detail by lazy {
-        Detail(
-            id = checkNotNull(savedStateHandle.get<Long>("id")),
-            image = checkNotNull(savedStateHandle.get<String>("image")),
-        )
-    }
+    private val args = savedStateHandle.toRoute<Detail>()
 
     private val _imageState = MutableStateFlow(args.id to args.image)
     val imageState = _imageState.asStateFlow()