feat(chat): 채팅방 UI 모델 매핑을 추가한다

app/src/main/java/kr/co/vividnext/sodalive/v2/main/chat/model/ChatRoomMappers.kt

@@ -0,0 +1,24 @@
+package kr.co.vividnext.sodalive.v2.main.chat.model
+
+import android.content.Context
+import kr.co.vividnext.sodalive.v2.main.chat.data.ChatRoomListItemResponse
+
+fun ChatRoomListItemResponse.toUiItem(context: Context): ChatRoomListUiItem? {
+    val type = when (chatType) {
+        ChatRoomType.AI.name -> ChatRoomType.AI
+        ChatRoomType.DM.name -> ChatRoomType.DM
+        else -> return null
+    }
+
+    return ChatRoomListUiItem(
+        roomId = roomId,
+        chatType = type,
+        targetName = targetName,
+        targetImageUrl = targetImageUrl,
+        lastMessage = lastMessage,
+        lastMessageTimeText = formatChatRoomLastMessageTime(context, lastMessageAt),
+        showDirectBadge = type == ChatRoomType.DM
+    )
+}
+
+fun List<ChatRoomListItemResponse>.toUiItems(context: Context): List<ChatRoomListUiItem> = mapNotNull { it.toUiItem(context) }

app/src/main/java/kr/co/vividnext/sodalive/v2/main/chat/model/ChatRoomUiModels.kt

@@ -0,0 +1,29 @@
+package kr.co.vividnext.sodalive.v2.main.chat.model
+
+enum class ChatRoomType {
+    AI,
+    DM
+}
+
+data class ChatRoomListUiItem(
+    val roomId: Long,
+    val chatType: ChatRoomType,
+    val targetName: String,
+    val targetImageUrl: String,
+    val lastMessage: String,
+    val lastMessageTimeText: String,
+    val showDirectBadge: Boolean
+)
+
+sealed class ChatRoomListUiState {
+    data object Loading : ChatRoomListUiState()
+
+    data class Content(
+        val items: List<ChatRoomListUiItem>,
+        val isAppending: Boolean = false
+    ) : ChatRoomListUiState()
+
+    data object Empty : ChatRoomListUiState()
+
+    data class Error(val message: String?) : ChatRoomListUiState()
+}

app/src/test/java/kr/co/vividnext/sodalive/v2/main/chat/ChatRoomMapperTest.kt

@@ -0,0 +1,83 @@
+package kr.co.vividnext.sodalive.v2.main.chat
+
+import android.app.Application
+import android.content.Context
+import androidx.test.core.app.ApplicationProvider
+import kr.co.vividnext.sodalive.v2.main.chat.data.ChatRoomListItemResponse
+import kr.co.vividnext.sodalive.v2.main.chat.model.ChatRoomType
+import kr.co.vividnext.sodalive.v2.main.chat.model.formatChatRoomLastMessageTime
+import kr.co.vividnext.sodalive.v2.main.chat.model.toUiItem
+import kr.co.vividnext.sodalive.v2.main.chat.model.toUiItems
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertNull
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.annotation.Config
+
+@RunWith(RobolectricTestRunner::class)
+@Config(sdk = [28], application = Application::class)
+class ChatRoomMapperTest {
+
+    private val context: Context = ApplicationProvider.getApplicationContext()
+
+    @Test
+    fun `AI 채팅방은 Direct badge 미표시 item으로 매핑된다`() {
+        val item = response(chatType = "AI").toUiItem(context)
+
+        requireNotNull(item)
+        assertEquals(ChatRoomType.AI, item.chatType)
+        assertFalse(item.showDirectBadge)
+    }
+
+    @Test
+    fun `DM 채팅방은 Direct badge 표시 item으로 매핑된다`() {
+        val item = response(chatType = "DM").toUiItem(context)
+
+        requireNotNull(item)
+        assertEquals(ChatRoomType.DM, item.chatType)
+        assertTrue(item.showDirectBadge)
+    }
+
+    @Test
+    fun `응답 필드는 그대로 전달하고 시간은 표시 문구로 매핑한다`() {
+        val item = response(
+            roomId = 20L,
+            targetName = "상대방",
+            targetImageUrl = "https://example.com/profile.png",
+            lastMessage = "마지막 메시지",
+            lastMessageAt = "2026-06-09T11:57:00Z"
+        ).toUiItem(context)
+
+        requireNotNull(item)
+        assertEquals(20L, item.roomId)
+        assertEquals("상대방", item.targetName)
+        assertEquals("https://example.com/profile.png", item.targetImageUrl)
+        assertEquals("마지막 메시지", item.lastMessage)
+        assertEquals(formatChatRoomLastMessageTime(context, "2026-06-09T11:57:00Z"), item.lastMessageTimeText)
+    }
+
+    @Test
+    fun `알 수 없는 chatType은 표시 대상에서 제외한다`() {
+        assertNull(response(chatType = "GROUP").toUiItem(context))
+        assertEquals(emptyList<Any>(), listOf(response(chatType = "GROUP")).toUiItems(context))
+    }
+
+    private fun response(
+        roomId: Long = 10L,
+        chatType: String = "AI",
+        targetName: String = "크리에이터",
+        targetImageUrl: String = "https://example.com/image.png",
+        lastMessage: String = "안녕하세요",
+        lastMessageAt: String = "2026-06-09T12:00:00Z"
+    ) = ChatRoomListItemResponse(
+        roomId = roomId,
+        chatType = chatType,
+        targetName = targetName,
+        targetImageUrl = targetImageUrl,
+        lastMessage = lastMessage,
+        lastMessageAt = lastMessageAt
+    )
+}