fix: 恢复 AnimatedGif 弹跳动画和 YearGridView 全量 sharedElement

- AnimatedGif: 恢复原始 scale 弹跳入场动画，仅保留 repeatCount 限制
- YearGridView: 恢复所有 12 个月的 sharedElement，保证点击任意
  月份都有正确的共享元素转场动画
- CalendarPager: beyondViewportPageCount 1→0 保留（无视觉影响）

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

@@ -2,6 +2,8 @@ package plus.rua.project.ui
 
 import androidx.compose.animation.core.Animatable
 import androidx.compose.animation.core.FastOutSlowInEasing
+import androidx.compose.animation.core.Spring
+import androidx.compose.animation.core.spring
 import androidx.compose.animation.core.tween
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
@@ -38,13 +40,17 @@ fun AnimatedGif(
 ) {
     val webpFile = remember(seed) { WEBP_FILES.random() }
     val uri = remember(webpFile) { getWebpUri(webpFile) }
-    val alpha = remember { Animatable(0f) }
+    val scale = remember { Animatable(0f) }
 
     LaunchedEffect(seed) {
-        alpha.snapTo(0f)
-        alpha.animateTo(
+        scale.snapTo(0f)
+        scale.animateTo(
+            targetValue = 1.1f,
+            animationSpec = tween(250, easing = FastOutSlowInEasing),
+        )
+        scale.animateTo(
             targetValue = 1f,
-            animationSpec = tween(150, easing = FastOutSlowInEasing),
+            animationSpec = spring(dampingRatio = Spring.DampingRatioMediumBouncy),
         )
     }
 
@@ -57,7 +63,9 @@ fun AnimatedGif(
         contentDescription = contentDescription,
         state = state,
         modifier = modifier.graphicsLayer {
-            this.alpha = alpha.value
+            scaleX = scale.value
+            scaleY = scale.value
+            alpha = scale.value.coerceIn(0f, 1f)
         },
     )
 }

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

@@ -167,12 +167,11 @@ fun YearGridView(
                 ) {
                     (0 until 3).forEach { col ->
                         val month = row * 3 + col + 1
-                        val isSelectedMonth = month == selectedMonth
                         with(sharedTransitionScope) {
                             MiniMonth(
                                 year = year,
                                 month = month,
-                                isSelected = isSelectedMonth,
+                                isSelected = month == selectedMonth,
                                 today = today,
                                 days = monthDays[month - 1],
                                 colors = colors,
@@ -182,19 +181,13 @@ fun YearGridView(
                                 onClick = { onMonthClick(month) },
                                 modifier = Modifier
                                     .weight(1f)
-                                    .then(
-                                        if (isSelectedMonth) {
-                                            Modifier.sharedElement(
-                                                sharedContentState = rememberSharedContentState(
-                                                    key = "month_grid_${year}_$month"
-                                                ),
-                                                animatedVisibilityScope = animatedVisibilityScope,
-                                                boundsTransform = { _, _ ->
-                                                    tween(400, easing = FastOutSlowInEasing)
-                                                }
-                                            )
-                                        } else {
-                                            Modifier
+                                    .sharedElement(
+                                        sharedContentState = rememberSharedContentState(
+                                            key = "month_grid_${year}_$month"
+                                        ),
+                                        animatedVisibilityScope = animatedVisibilityScope,
+                                        boundsTransform = { _, _ ->
+                                            tween(400, easing = FastOutSlowInEasing)
                                         }
                                     )
                             )