fix: 리뷰 반영 — Init 재초기화 방지·뒤로 애니메이션·폼 프리즈·접근성·에러 분기

- savedInstanceState == null 가드로 회전 시 편집 중 닉네임 초기화 방지
- 툴바 뒤로 버튼에 overridePendingTransition 적용(시스템 뒤로와 동일)
- isLoading 중 submitEnabled/NicknameTextField.enabled = false로 폼 잠금
- 뒤로 버튼 Image contentDescription 추가(스크린리더 대응)
- onFailure에서 getCode() == 400일 때만 ShowDuplicateError 발행
  (네트워크·서버 오류를 중복 닉네임 오류로 오표기하던 문제 수정)

Author: unam98

app/src/main/java/com/runnect/runnect/presentation/mypage/editname/MyPageEditNameActivity.kt

@@ -29,9 +29,11 @@ class MyPageEditNameActivity : AppCompatActivity() {
         enableEdgeToEdge()
         Analytics.logEvent(EventName.VIEW_EDIT_PROFILE)
 
-        val nickname = intent.getStringExtra(EXTRA_NICK_NAME) ?: ""
-        val profileImgResId = intent.getIntExtra(EXTRA_PROFILE, R.drawable.user_profile_basic)
-        viewModel.intent(EditNameIntent.Init(nickname, profileImgResId))
+        if (savedInstanceState == null) {
+            val nickname = intent.getStringExtra(EXTRA_NICK_NAME) ?: ""
+            val profileImgResId = intent.getIntExtra(EXTRA_PROFILE, R.drawable.user_profile_basic)
+            viewModel.intent(EditNameIntent.Init(nickname, profileImgResId))
+        }
 
         setContent {
             RunnectTheme {
@@ -41,6 +43,7 @@ class MyPageEditNameActivity : AppCompatActivity() {
                     onBackClick = {
                         setResult(RESULT_CANCELED)
                         finish()
+                        overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_right)
                     },
                     onNicknameChange = { viewModel.intent(EditNameIntent.UpdateNickname(it)) },
                     onSubmitClick = { viewModel.intent(EditNameIntent.Submit) },

app/src/main/java/com/runnect/runnect/presentation/mypage/editname/MyPageEditNameScreen.kt

@@ -52,7 +52,7 @@ fun MyPageEditNameScreen(
             EditNameToolbar(
                 onBackClick = onBackClick,
                 onSubmitClick = onSubmitClick,
-                submitEnabled = state.nickname.isNotEmpty(),
+                submitEnabled = state.nickname.isNotEmpty() && !state.isLoading,
             )
             Column(
                 modifier = Modifier
@@ -71,6 +71,7 @@ fun MyPageEditNameScreen(
                     value = state.nickname,
                     onValueChange = onNicknameChange,
                     onDone = { focusManager.clearFocus() },
+                    enabled = !state.isLoading,
                 )
             }
         }
@@ -100,7 +101,7 @@ private fun EditNameToolbar(
     ) {
         Image(
             painter = painterResource(R.drawable.all_back_arrow),
-            contentDescription = null,
+            contentDescription = stringResource(R.string.my_page_edit_name_back),
             modifier = Modifier
                 .size(24.dp)
                 .clickable(onClick = onBackClick),
@@ -128,6 +129,7 @@ private fun NicknameTextField(
     value: String,
     onValueChange: (String) -> Unit,
     onDone: () -> Unit,
+    enabled: Boolean = true,
 ) {
     val textStyle = RunnectTheme.textStyle
     // OutlinedTextField enforces a 56dp minimum height (M3 internal contentPadding),
@@ -139,6 +141,7 @@ private fun NicknameTextField(
         modifier = Modifier
             .fillMaxWidth()
             .height(44.dp),
+        enabled = enabled,
         textStyle = textStyle.semiBold15.copy(textAlign = TextAlign.Center, color = G1),
         singleLine = true,
         keyboardOptions = KeyboardOptions(imeAction = ImeAction.Done),

app/src/main/java/com/runnect/runnect/presentation/mypage/editname/MyPageEditNameViewModel.kt

@@ -1,11 +1,14 @@
 package com.runnect.runnect.presentation.mypage.editname
 
 import com.runnect.runnect.data.dto.request.RequestPatchNickName
+import com.runnect.runnect.domain.common.getCode
 import com.runnect.runnect.domain.repository.UserRepository
 import com.runnect.runnect.presentation.base.MviViewModel
 import dagger.hilt.android.lifecycle.HiltViewModel
 import javax.inject.Inject
 
+private const val HTTP_DUPLICATE_NICKNAME = 400
+
 @HiltViewModel
 class MyPageEditNameViewModel @Inject constructor(
     private val userRepository: UserRepository
@@ -33,9 +36,11 @@ class MyPageEditNameViewModel @Inject constructor(
                 reduce { copy(isLoading = false) }
                 postEffect(EditNameEffect.NavigateSuccess(currentState.nickname))
             },
-            onFailure = {
+            onFailure = { throwable ->
                 reduce { copy(isLoading = false) }
-                postEffect(EditNameEffect.ShowDuplicateError)
+                if (throwable.getCode() == HTTP_DUPLICATE_NICKNAME) {
+                    postEffect(EditNameEffect.ShowDuplicateError)
+                }
             }
         )
     }

app/src/main/res/values/strings.xml

@@ -83,6 +83,7 @@
 
     <string name="my_page_setting_title">설정</string>
     <string name="my_page_version_title">버전 정보</string>
+    <string name="my_page_edit_name_back">뒤로 가기</string>
     <string name="my_page_edit_name_title">닉네임 수정</string>
     <string name="my_page_edit_name_finish">완료</string>
     <string name="my_page_edit_name_guide">닉네임을 입력하세요</string>

app/src/test/java/com/runnect/runnect/presentation/mypage/editname/MyPageEditNameViewModelTest.kt

@@ -2,6 +2,7 @@ package com.runnect.runnect.presentation.mypage.editname
 
 import app.cash.turbine.test
 import app.cash.turbine.turbineScope
+import com.runnect.runnect.domain.common.RunnectException
 import com.runnect.runnect.domain.repository.UserRepository
 import io.mockk.coEvery
 import io.mockk.mockk
@@ -107,7 +108,7 @@ class MyPageEditNameViewModelTest {
         runTest(testDispatcher) {
             coEvery { userRepository.updateNickName(any()) } returns flow {
                 delay(1)
-                throw RuntimeException("닉네임 중복")
+                throw RunnectException(code = 400, message = "닉네임 중복")
             }
 
             turbineScope {