feat: show tilted birthday crown with click bounce animation

core/src/main/kotlin/plus/rua/project/ui/DayCell.kt

@@ -1,9 +1,12 @@
 package plus.rua.project.ui
 
 import androidx.compose.animation.animateColor
+import androidx.compose.animation.core.Animatable
 import androidx.compose.animation.core.FastOutSlowInEasing
+import androidx.compose.animation.core.Spring
 import androidx.compose.animation.core.animateFloat
 import androidx.compose.animation.core.animateFloatAsState
+import androidx.compose.animation.core.spring
 import androidx.compose.animation.core.tween
 import androidx.compose.animation.core.updateTransition
 import androidx.compose.ui.graphics.TransformOrigin
@@ -16,14 +19,19 @@ import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.aspectRatio
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.produceState
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
@@ -31,6 +39,7 @@ import androidx.compose.ui.draw.drawBehind
 import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.drawscope.Stroke
+import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.semantics.contentDescription
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.text.font.FontWeight
@@ -44,6 +53,7 @@ import kotlinx.datetime.number
 import plus.rua.project.DayCellInfo
 import plus.rua.project.LunarCache
 import plus.rua.project.ShiftKind
+import plus.rua.project.shared.R
 
 enum class DayCellState {
     NORMAL, OTHER_MONTH, TODAY, SELECTED, SELECTED_TODAY
@@ -63,6 +73,9 @@ enum class DayCellState {
  * @param holidayEdgeInfo 假日在连续序列中的边缘状态,决定背景圆角。null 表示无假日。
  * @param cellIndex 单元格在月网格中的线性索引(weekIndex*7+dayIndex),用于法定假日波浪动画延迟。
  * @param onClick 点击回调
+ * @param interactionSource 点击交互源
+ * @param lunarCache 农历缓存实例
+ * @param lunarData 预计算的日期信息；null 时内部自动获取
  * @param modifier 外部布局修饰符
  */
 @Composable
@@ -76,10 +89,10 @@ fun DayCell(
     holidayEdgeInfo: HolidayEdgeInfo? = null,
     cellIndex: Int = 0,
     onClick: () -> Unit,
-    modifier: Modifier = Modifier,
     interactionSource: MutableInteractionSource = remember { MutableInteractionSource() },
     lunarCache: LunarCache = LunarCache.default,
     lunarData: DayCellInfo? = null,
+    modifier: Modifier = Modifier,
 ) {
     if (lunarData != null) {
         DayCellImpl(
@@ -136,6 +149,16 @@ private fun DayCellImpl(
     interactionSource: MutableInteractionSource,
     lunarData: DayCellInfo,
 ) {
+    val isBirthday = lunarData.isBirthday
+    var birthdayClickTick by remember(date) { mutableIntStateOf(0) }
+    val crownScale = remember(date) { Animatable(1f) }
+    LaunchedEffect(birthdayClickTick) {
+        if (birthdayClickTick > 0) {
+            crownScale.animateTo(1.4f, spring(dampingRatio = Spring.DampingRatioMediumBouncy))
+            crownScale.animateTo(1f, spring(dampingRatio = Spring.DampingRatioMediumBouncy))
+        }
+    }
+
     val annotationText = lunarData.annotationText
     val isAnnotationHighlight = lunarData.isAnnotationHighlight
     val holidayBadge = lunarData.holidayBadge
@@ -296,7 +319,10 @@ private fun DayCellImpl(
                 .clickable(
                     interactionSource = interactionSource,
                     indication = null,
-                    onClick = onClick
+                    onClick = {
+                        if (isBirthday) birthdayClickTick += 1
+                        onClick()
+                    }
                 ),
             contentAlignment = Alignment.Center
         ) {
@@ -346,5 +372,23 @@ private fun DayCellImpl(
                 )
             }
         }
+        if (isBirthday) {
+            Icon(
+                painter = painterResource(R.drawable.ic_birthday_crown),
+                contentDescription = "生日",
+                tint = Color.Unspecified,
+                modifier = Modifier
+                    .align(Alignment.TopStart)
+                    .zIndex(1f)
+                    .padding(start = 2.dp, top = 2.dp)
+                    .size(14.dp)
+                    .graphicsLayer {
+                        rotationZ = -45f
+                        transformOrigin = TransformOrigin.Center
+                        scaleX = crownScale.value
+                        scaleY = crownScale.value
+                    }
+            )
+        }
     }
 }