feat: 즐겨찾기 기능 프레젠테이션 레이어 추가

- MainViewModel에 즐겨찾기 토글/설정 메서드 추가
- DealItem에 즐겨찾기 버튼 및 콜백 추가
- DealListScreen에 즐겨찾기 필터 탭 추가
- 키워드 카드 색상을 옅은 붉은색으로 변경

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

app/src/main/java/com/hotdeal/alarm/presentation/components/DealItem.kt

@@ -32,13 +32,13 @@ import com.hotdeal.alarm.util.ShareHelper
 fun DealItem(
  deal: HotDeal,
  onClick: () -> Unit,
+ onFavoriteToggle: (String) -> Unit = {},
  modifier: Modifier = Modifier
 ) {
-    var isFavorite by remember { mutableStateOf(false) }
  val context = LocalContext.current
 
  val favoriteScale by animateFloatAsState(
-        targetValue = if (isFavorite) 1.2f else 1f,
+ targetValue = if (deal.isFavorite) 1.2f else 1f,
  animationSpec = spring(
  dampingRatio = Spring.DampingRatioMediumBouncy,
  stiffness = Spring.StiffnessLow
@@ -205,15 +205,15 @@ fun DealItem(
 
  // 즐겨찾기 버튼
  IconButton(
-                            onClick = { isFavorite = !isFavorite },
+ onClick = { onFavoriteToggle(deal.id) },
  modifier = Modifier
  .size(36.dp)
  .scale(favoriteScale)
  ) {
  Icon(
-                                imageVector = if (isFavorite) Icons.Filled.Favorite else Icons.Outlined.FavoriteBorder,
-                                contentDescription = if (isFavorite) "즐겨찾기 제거" else "즐겨찾기 추가",
-                                tint = if (isFavorite)
+ imageVector = if (deal.isFavorite) Icons.Filled.Favorite else Icons.Outlined.FavoriteBorder,
+ contentDescription = if (deal.isFavorite) "즐겨찾기 제거" else "즐겨찾기 추가",
+ tint = if (deal.isFavorite)
  MaterialTheme.colorScheme.error
  else
  MaterialTheme.colorScheme.onSurfaceVariant,

app/src/main/java/com/hotdeal/alarm/presentation/deallist/DealListScreen.kt

@@ -42,6 +42,7 @@ fun DealListScreen(
 
  var searchText by remember { mutableStateOf("") }
  var selectedSiteFilter by remember { mutableStateOf<SiteType?>(null) }
+ var showFavoritesOnly by remember { mutableStateOf(false) }
  var showFilterMenu by remember { mutableStateOf(false) }
 
     Column(modifier = Modifier.fillMaxSize()) {
@@ -161,6 +162,14 @@ fun DealListScreen(
  color = color
  )
  }
+
+ // 즐겨찾기 필터
+ EnhancedFilterChip(
+ selected = showFavoritesOnly,
+ onClick = { showFavoritesOnly = !showFavoritesOnly },
+ label = "즐겨찾기",
+ color = MaterialTheme.colorScheme.error
+ )
                     }
                 }
             }
@@ -210,13 +219,14 @@ fun DealListScreen(
             }
 
             is MainUiState.Success -> {
-                val filteredDeals = remember(state.deals, searchText, selectedSiteFilter) {
+ val filteredDeals = remember(state.deals, searchText, selectedSiteFilter, showFavoritesOnly) {
  state.deals.filter { deal ->
  val matchesSearch = searchText.isBlank() ||
  deal.title.contains(searchText, ignoreCase = true)
  val matchesSite = selectedSiteFilter == null ||
  deal.siteType == selectedSiteFilter
-                        matchesSearch && matchesSite
+ val matchesFavorite = !showFavoritesOnly || deal.isFavorite
+ matchesSearch && matchesSite && matchesFavorite
  }
                 }
 
@@ -294,6 +304,9 @@ fun DealListScreen(
  onClick = {
  val intent = Intent(Intent.ACTION_VIEW, Uri.parse(deal.url))
  context.startActivity(intent)
+ },
+ onFavoriteToggle = { dealId ->
+ viewModel.toggleFavorite(dealId)
  }
  )
                             }

app/src/main/java/com/hotdeal/alarm/presentation/main/MainViewModel.kt

@@ -108,6 +108,24 @@ class MainViewModel @Inject constructor(
  viewModelScope.launch {
  keywordDao.updateEnabled(id, enabled)
  }
+ }
+
+ /**
+ * 즐겨찾기 토글
+ */
+ fun toggleFavorite(dealId: String) {
+ viewModelScope.launch {
+ hotDealDao.toggleFavorite(dealId)
+ }
+ }
+
+ /**
+ * 즐겨찾기 설정
+ */
+ fun setFavorite(dealId: String, isFavorite: Boolean) {
+ viewModelScope.launch {
+ hotDealDao.setFavorite(dealId, isFavorite)
+ }
  }
     
     fun refresh() {

app/src/main/java/com/hotdeal/alarm/presentation/settings/SettingsScreen.kt

@@ -754,10 +754,7 @@ private fun EnhancedKeywordCard(
  Box(
  modifier = Modifier.size(40.dp)
  .background(
-                        if (keyword.isEnabled) 
-                            MaterialTheme.colorScheme.primary
-                        else 
-                            MaterialTheme.colorScheme.outline.copy(alpha = 0.5f),
+ Color(0xFFFFCDD2), // 옅은 붉은색 (Light Red)
  CircleShape
  ),
  contentAlignment = Alignment.Center
@@ -765,7 +762,7 @@ private fun EnhancedKeywordCard(
  Icon(
  imageVector = Icons.Filled.Tag,
  contentDescription = null,
-                    tint = Color.White,
+ tint = Color(0xFFD32F2F), // 붉은색 아이콘
  modifier = Modifier.size(20.dp)
  )
  }