レビュー指摘の反映: 共有可変フィールドの可視性保証とテスト断言の補強

- 別スレッドから更新される接続先アドレスの書き込み可視性を保証
- 練習モードの店舗選択テストに失敗フラグの検証を追加

https://claude.ai/code/session_01TbRomX8cQTi7d8w5hEBMQd

Author: claude

app/src/main/kotlin/info/nukoneko/cuc/android/kidspos/api/ServerSelectionInterceptor.kt

@@ -3,7 +3,7 @@ package info.nukoneko.cuc.android.kidspos.api
 import okhttp3.Interceptor
 import okhttp3.Response
 
-class ServerSelectionInterceptor(var serverAddress: String) : Interceptor {
+class ServerSelectionInterceptor(@Volatile var serverAddress: String) : Interceptor {
     override fun intercept(chain: Interceptor.Chain): Response {
         var request = chain.request()
         if (serverAddress.isNotEmpty()) {

app/src/testProd/kotlin/info/nukoneko/cuc/android/kidspos/ui/main/MainViewModelTest.kt

@@ -274,6 +274,7 @@ class MainViewModelTest {
         val selection = viewModel.uiState.value.storeSelection
         assertNotNull(selection)
         assertEquals(false, selection?.loading)
+        assertEquals(false, selection?.failed)
         assertEquals(2, selection?.stores?.size)
         assertTrue(apiService.createSaleCalls.isEmpty())
     }