feat(creator): 후원 탭 UI 모델 매핑을 추가한다

app/src/main/java/kr/co/vividnext/sodalive/v2/creator/channel/donation/model/CreatorChannelDonationMappers.kt

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+package kr.co.vividnext.sodalive.v2.creator.channel.donation.model
+
+import android.content.Context
+import androidx.annotation.ColorRes
+import kr.co.vividnext.sodalive.R
+import kr.co.vividnext.sodalive.common.UtcRelativeTimeTextFormatter
+import kr.co.vividnext.sodalive.v2.creator.channel.donation.data.CreatorChannelDonationResponse
+import kr.co.vividnext.sodalive.v2.creator.channel.donation.data.MemberDonationRankingResponse
+
+fun List<MemberDonationRankingResponse>.toDonationRankingUiModels(): List<CreatorChannelDonationRankingUiModel> =
+    mapIndexed { index, response -> response.toDonationRankingUiModel(rank = index + 1) }
+
+fun List<CreatorChannelDonationResponse>.toDonationUiModels(
+    context: Context,
+    relativeTimeTextFormatter: UtcRelativeTimeTextFormatter
+): List<CreatorChannelDonationUiModel> = map { it.toDonationUiModel(context, relativeTimeTextFormatter) }
+
+private fun MemberDonationRankingResponse.toDonationRankingUiModel(rank: Int) = CreatorChannelDonationRankingUiModel(
+    rank = rank,
+    userId = userId,
+    nickname = nickname,
+    profileImageUrl = profileImage,
+    donationCan = donationCan
+)
+
+private fun CreatorChannelDonationResponse.toDonationUiModel(
+    context: Context,
+    relativeTimeTextFormatter: UtcRelativeTimeTextFormatter
+) = CreatorChannelDonationUiModel(
+    nickname = nickname,
+    profileImageUrl = profileImageUrl,
+    can = can,
+    message = message.takeUnless { it.isBlank() } ?: context.getString(R.string.creator_channel_donation_fallback_message, can),
+    createdAtText = relativeTimeTextFormatter.format(createdAtUtc),
+    headerColorResId = calculateDonationHeaderColorRes(can)
+)
+
+@ColorRes
+internal fun calculateDonationHeaderColorRes(can: Int): Int = when {
+    can >= 500 -> R.color.red_400
+    can >= 101 -> R.color.creator_channel_donation_cyan
+    can >= 51 -> R.color.green_400
+    else -> R.color.gray_200
+}

app/src/main/java/kr/co/vividnext/sodalive/v2/creator/channel/donation/model/CreatorChannelDonationUiModels.kt

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+package kr.co.vividnext.sodalive.v2.creator.channel.donation.model
+
+import androidx.annotation.ColorRes
+
+data class CreatorChannelDonationRankingUiModel(
+    val rank: Int,
+    val userId: Long,
+    val nickname: String,
+    val profileImageUrl: String,
+    val donationCan: Int
+)
+
+data class CreatorChannelDonationUiModel(
+    val nickname: String,
+    val profileImageUrl: String,
+    val can: Int,
+    val message: String,
+    val createdAtText: String,
+    @param:ColorRes val headerColorResId: Int
+)

app/src/test/java/kr/co/vividnext/sodalive/v2/creator/channel/donation/CreatorChannelDonationMapperTest.kt

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+package kr.co.vividnext.sodalive.v2.creator.channel.donation
+
+import android.app.Application
+import android.content.Context
+import androidx.test.core.app.ApplicationProvider
+import kr.co.vividnext.sodalive.R
+import kr.co.vividnext.sodalive.common.AndroidUtcRelativeTimeTextFormatter
+import kr.co.vividnext.sodalive.v2.creator.channel.donation.data.CreatorChannelDonationResponse
+import kr.co.vividnext.sodalive.v2.creator.channel.donation.data.MemberDonationRankingResponse
+import kr.co.vividnext.sodalive.v2.creator.channel.donation.model.toDonationRankingUiModels
+import kr.co.vividnext.sodalive.v2.creator.channel.donation.model.toDonationUiModels
+import org.junit.Assert.assertEquals
+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 CreatorChannelDonationMapperTest {
+
+    private val context: Context = ApplicationProvider.getApplicationContext()
+    private val relativeTimeTextFormatter = AndroidUtcRelativeTimeTextFormatter(context)
+
+    @Test
+    fun `ranking rank는 응답 순서 기준 1부터 시작하고 profileImage를 profileImageUrl로 매핑한다`() {
+        val rankings = listOf(
+            ranking(userId = 10L, profileImage = "first.png"),
+            ranking(userId = 20L, profileImage = "second.png")
+        ).toDonationRankingUiModels()
+
+        assertEquals(listOf(1, 2), rankings.map { it.rank })
+        assertEquals(listOf(10L, 20L), rankings.map { it.userId })
+        assertEquals(listOf("first.png", "second.png"), rankings.map { it.profileImageUrl })
+    }
+
+    @Test
+    fun `후원 message가 blank이면 can을 포함한 fallback 문구를 사용한다`() {
+        val item = listOf(donation(can = 50, message = " "))
+            .toDonationUiModels(context, relativeTimeTextFormatter)
+            .single()
+
+        assertEquals(context.getString(R.string.creator_channel_donation_fallback_message, 50), item.message)
+    }
+
+    @Test
+    fun `후원 createdAtUtc는 상대 시간으로 매핑하고 can 기준 header color를 계산한다`() {
+        val item = listOf(donation(can = 500, createdAtUtc = System.currentTimeMillis().toString()))
+            .toDonationUiModels(context, relativeTimeTextFormatter)
+            .single()
+
+        assertEquals(context.getString(R.string.character_comment_time_just_now), item.createdAtText)
+        assertEquals(R.color.red_400, item.headerColorResId)
+    }
+
+    private fun ranking(
+        userId: Long,
+        nickname: String = "member",
+        profileImage: String = "profile.png",
+        donationCan: Int = 100
+    ) = MemberDonationRankingResponse(
+        userId = userId,
+        nickname = nickname,
+        profileImage = profileImage,
+        donationCan = donationCan
+    )
+
+    private fun donation(
+        nickname: String = "member",
+        profileImageUrl: String = "profile.png",
+        can: Int = 50,
+        message: String = "응원합니다",
+        createdAtUtc: String = "2026-06-21T00:00:00Z"
+    ) = CreatorChannelDonationResponse(
+        nickname = nickname,
+        profileImageUrl = profileImageUrl,
+        can = can,
+        message = message,
+        createdAtUtc = createdAtUtc
+    )
+}