feat(live-room): 하트 롱프레스 시 가운데 빈 하트가 표시되고 물 채워지는 애니메이션 추가

SodaLive/Sources/Live/Room/V2/LiveRoomViewV2.swift

@@ -8,6 +8,7 @@
 import SwiftUI
 import Kingfisher
 import SDWebImageSwiftUI
+import Combine
 
 struct LiveRoomViewV2: View {
     
@@ -17,6 +18,14 @@ struct LiveRoomViewV2: View {
     @State private var textHeight: CGFloat = .zero
     @State private var menuTextHeight: CGFloat = .zero
     
+    // 롱프레스 하트 물 채우기 상태
+    @State private var isLongPressingHeart: Bool = false
+    @State private var longPressStartAt: Date? = nil
+    @State private var showWaterHeart: Bool = false
+    @State private var waterProgress: CGFloat = 0
+    @State private var wavePhase: CGFloat = 0
+    let heartWaveTimer = Timer.publish(every: 1/60, on: .main, in: .common).autoconnect()
+    
     var body: some View {
         ZStack {
             Color.black.edgesIgnoringSafeArea(.all)
@@ -256,6 +265,29 @@ struct LiveRoomViewV2: View {
                                                     onClick: { viewModel.likeHeart() },
                                                     onLongPress: { viewModel.likeHeart(messageType: .BIG_HEART_DONATION, heartCount: 100) }
                                                 )
+                                                .onLongPressGesture(
+                                                    minimumDuration: 2.0,
+                                                    maximumDistance: 50,
+                                                    pressing: { pressing in
+                                                        if pressing {
+                                                            if !isLongPressingHeart {
+                                                                isLongPressingHeart = true
+                                                                longPressStartAt = Date()
+                                                                // 초기 상태
+                                                                waterProgress = 0
+                                                                wavePhase = 0
+                                                            }
+                                                        } else {
+                                                            isLongPressingHeart = false
+                                                            showWaterHeart = false
+                                                            waterProgress = 0
+                                                            longPressStartAt = nil
+                                                        }
+                                                    },
+                                                    perform: {
+                                                        // perform는 내부 컴포넌트(onLongPress)에서 처리하므로 여기서는 중복 방지용으로 비워둠
+                                                    }
+                                                )
                                             }
                                         }
                                         
@@ -711,6 +743,33 @@ struct LiveRoomViewV2: View {
                 LoadingView()
             }
         }
+        .overlay(alignment: .center) {
+            WaterHeartView(progress: waterProgress, show: showWaterHeart, phase: wavePhase)
+                .frame(width: 280, height: 210) // 4:3 비율 유지
+                .allowsHitTesting(false)
+                .opacity(showWaterHeart ? 1 : 0)
+                .animation(.easeInOut(duration: 0.2), value: showWaterHeart)
+        }
+        .onReceive(heartWaveTimer) { _ in
+            guard isLongPressingHeart else { return }
+            let now = Date()
+            if longPressStartAt == nil { longPressStartAt = now }
+            let elapsed = now.timeIntervalSince(longPressStartAt!)
+            if elapsed >= 0.5 {
+                if !showWaterHeart {
+                    withAnimation(.spring(response: 0.25, dampingFraction: 0.8)) {
+                        showWaterHeart = true
+                    }
+                }
+                let p = min(max((elapsed - 0.5) / 1.5, 0), 1)
+                waterProgress = p
+                // 파도 위상 진행
+                wavePhase += 0.25
+            } else {
+                showWaterHeart = false
+                waterProgress = 0
+            }
+        }
         .ignoresSafeArea(.keyboard)
         .edgesIgnoringSafeArea(keyboardHandler.keyboardHeight > 0 ? .bottom : .init())
         .sheet(