feat(live): 온에어 라이브 매핑을 추가한다

app/src/main/java/kr/co/vividnext/sodalive/v2/live/onair/model/HomeOnAirLiveMappers.kt

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+package kr.co.vividnext.sodalive.v2.live.onair.model
+
+import kr.co.vividnext.sodalive.v2.live.onair.data.HomeOnAirLivePageResponse
+import kr.co.vividnext.sodalive.v2.live.onair.data.HomeOnAirLiveResponse
+import java.text.NumberFormat
+import java.text.ParseException
+import java.text.SimpleDateFormat
+import java.util.Locale
+import java.util.TimeZone
+
+fun HomeOnAirLivePageResponse.toUiState(
+    deviceTimeZone: TimeZone = TimeZone.getDefault()
+): HomeOnAirLiveUiState = HomeOnAirLiveUiState(
+    items = items.map { it.toUiModel(deviceTimeZone) },
+    page = page,
+    size = size,
+    hasNext = hasNext
+)
+
+fun HomeOnAirLiveResponse.toUiModel(
+    deviceTimeZone: TimeZone = TimeZone.getDefault()
+): HomeOnAirLiveUiModel = HomeOnAirLiveUiModel(
+    roomId = roomId,
+    creatorNickname = creatorNickname,
+    creatorProfileImage = creatorProfileImage,
+    title = title,
+    liveTimeText = "LIVE ${beginDateTimeUtc.toLiveStartTime(deviceTimeZone)}",
+    price = price.toPriceUiModel()
+)
+
+private fun Int.toPriceUiModel(): HomeOnAirLivePriceUiModel {
+    return if (this > 0) {
+        HomeOnAirLivePriceUiModel.Paid(
+            amount = this,
+            amountText = NumberFormat.getNumberInstance(Locale.KOREA).format(this)
+        )
+    } else {
+        HomeOnAirLivePriceUiModel.Free
+    }
+}
+
+private fun String.toLiveStartTime(deviceTimeZone: TimeZone): String {
+    val parsedDate = UTC_DATE_FORMATS.firstNotNullOfOrNull { format ->
+        try {
+            format.parse(this)
+        } catch (_: ParseException) {
+            null
+        }
+    } ?: return "--:--"
+
+    return SimpleDateFormat("HH:mm", Locale.US).apply {
+        timeZone = deviceTimeZone
+    }.format(parsedDate)
+}
+
+private val UTC_DATE_FORMATS = listOf(
+    "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'",
+    "yyyy-MM-dd'T'HH:mm:ss'Z'",
+    "yyyy-MM-dd'T'HH:mm:ss.SSS",
+    "yyyy-MM-dd'T'HH:mm:ss"
+).map { pattern ->
+    SimpleDateFormat(pattern, Locale.US).apply {
+        timeZone = TimeZone.getTimeZone("UTC")
+    }
+}

app/src/main/java/kr/co/vividnext/sodalive/v2/live/onair/model/HomeOnAirLiveUiModels.kt

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+package kr.co.vividnext.sodalive.v2.live.onair.model
+
+data class HomeOnAirLiveUiState(
+    val items: List<HomeOnAirLiveUiModel>,
+    val page: Int,
+    val size: Int,
+    val hasNext: Boolean,
+    val isLoadingMore: Boolean = false,
+    val paginationErrorMessage: String? = null
+)
+
+data class HomeOnAirLiveUiModel(
+    val roomId: Long,
+    val creatorNickname: String,
+    val creatorProfileImage: String,
+    val title: String,
+    val liveTimeText: String,
+    val price: HomeOnAirLivePriceUiModel
+)
+
+sealed interface HomeOnAirLivePriceUiModel {
+    data class Paid(
+        val amount: Int,
+        val amountText: String
+    ) : HomeOnAirLivePriceUiModel
+
+    data object Free : HomeOnAirLivePriceUiModel
+}
+
+sealed interface HomeOnAirLivePageUiState {
+    data object Loading : HomeOnAirLivePageUiState
+    data object Empty : HomeOnAirLivePageUiState
+    data class Content(val content: HomeOnAirLiveUiState) : HomeOnAirLivePageUiState
+    data class Error(val message: String?) : HomeOnAirLivePageUiState
+}

app/src/test/java/kr/co/vividnext/sodalive/v2/live/onair/HomeOnAirLiveMapperTest.kt

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+package kr.co.vividnext.sodalive.v2.live.onair
+
+import kr.co.vividnext.sodalive.v2.live.onair.data.HomeOnAirLivePageResponse
+import kr.co.vividnext.sodalive.v2.live.onair.data.HomeOnAirLiveResponse
+import kr.co.vividnext.sodalive.v2.live.onair.model.HomeOnAirLivePriceUiModel
+import kr.co.vividnext.sodalive.v2.live.onair.model.toUiState
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import java.util.TimeZone
+
+class HomeOnAirLiveMapperTest {
+
+    @Test
+    fun `beginDateTimeUtc를 디바이스 Timezone 기준 LIVE HH mm으로 변환한다`() {
+        val state = pageResponse(
+            items = listOf(live(beginDateTimeUtc = "2026-06-26T12:34:00Z"))
+        ).toUiState(TimeZone.getTimeZone("Asia/Seoul"))
+
+        assertEquals("LIVE 21:34", state.items.single().liveTimeText)
+    }
+
+    @Test
+    fun `price가 0보다 크면 유료 가격 표시 모델로 매핑한다`() {
+        val price = pageResponse(items = listOf(live(price = 150))).toUiState().items.single().price
+
+        assertTrue(price is HomeOnAirLivePriceUiModel.Paid)
+        assertEquals(150, (price as HomeOnAirLivePriceUiModel.Paid).amount)
+        assertEquals("150", price.amountText)
+    }
+
+    @Test
+    fun `price가 0이면 무료 표시 모델로 매핑한다`() {
+        val price = pageResponse(items = listOf(live(price = 0))).toUiState().items.single().price
+
+        assertTrue(price is HomeOnAirLivePriceUiModel.Free)
+    }
+
+    @Test
+    fun `page 응답의 metadata와 items를 UI state로 유지한다`() {
+        val state = pageResponse(
+            page = 2,
+            size = 20,
+            hasNext = true,
+            items = listOf(live(roomId = 10L), live(roomId = 11L))
+        ).toUiState()
+
+        assertEquals(2, state.page)
+        assertEquals(20, state.size)
+        assertTrue(state.hasNext)
+        assertEquals(listOf(10L, 11L), state.items.map { it.roomId })
+    }
+
+    private fun pageResponse(
+        items: List<HomeOnAirLiveResponse> = listOf(live()),
+        page: Int = 0,
+        size: Int = 20,
+        hasNext: Boolean = false
+    ) = HomeOnAirLivePageResponse(
+        items = items,
+        page = page,
+        size = size,
+        hasNext = hasNext
+    )
+
+    private fun live(
+        roomId: Long = 1L,
+        creatorNickname: String = "크리에이터",
+        creatorProfileImage: String = "https://example.com/profile.png",
+        title: String = "라이브 제목",
+        price: Int = 100,
+        beginDateTimeUtc: String = "2026-06-26T12:00:00Z"
+    ) = HomeOnAirLiveResponse(
+        roomId = roomId,
+        creatorNickname = creatorNickname,
+        creatorProfileImage = creatorProfileImage,
+        title = title,
+        price = price,
+        beginDateTimeUtc = beginDateTimeUtc
+    )
+}