Merge pull request #2 from xunrua/main

优化月→年视图切换卡顿：Pager 缓存降为 0 + 移除延迟预组合

shared/src/commonMain/kotlin/plus/rua/project/ui/CalendarMonthView.kt

@@ -51,7 +51,6 @@ import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.layout.onSizeChanged
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.unit.dp
-import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
 import kotlinx.datetime.DatePeriod
 import kotlinx.datetime.LocalDate
@@ -93,24 +92,11 @@ fun CalendarMonthView(
     var screenHeightPx by remember { mutableIntStateOf(0) }
     var calendarContentHeightPx by remember { mutableIntStateOf(0) }
     var isMenuExpanded by remember { mutableStateOf(false) }
-    var yearPagerBeyondViewport by remember { mutableStateOf(0) }
-
     // 视图切换时自动关闭菜单
     LaunchedEffect(viewModel.isYearView) {
         isMenuExpanded = false
     }
 
-    // 年视图动画完成后再恢复预组合，避免动画期间触发邻页组合阻塞帧
-    LaunchedEffect(viewModel.isYearView) {
-        if (viewModel.isYearView) {
-            snapshotFlow { viewModel.yearViewProgress }
-                .first { it >= 1f }
-            yearPagerBeyondViewport = 1
-        } else {
-            yearPagerBeyondViewport = 0
-        }
-    }
-
     val pagerState = rememberPagerState(initialPage = START_PAGE, pageCount = { Int.MAX_VALUE })
 
     // 年视图分页器
@@ -233,6 +219,9 @@ fun CalendarMonthView(
             }
 
             val monthProgress = 1f - viewModel.yearViewProgress
+            // 组合阶段计算：lambda 捕获快照值，避免 draw 阶段读到已更新的 rowHeightPx
+            // 但 layout 仍用旧值导致行堆叠
+            val layoutReady = rowHeightPx > 0
             Box(
                 modifier = Modifier
                     .fillMaxSize()
@@ -240,7 +229,7 @@ fun CalendarMonthView(
                         val scale = lerp(0.3f, 1f, monthProgress)
                         scaleX = scale
                         scaleY = scale
-                        alpha = monthProgress.coerceIn(0f, 1f)
+                        alpha = if (layoutReady) monthProgress.coerceIn(0f, 1f) else 0f
                         transformOrigin = TransformOrigin(anchorPivotX, anchorPivotY)
                     }
             ) {
@@ -361,7 +350,7 @@ fun CalendarMonthView(
                 )
                 HorizontalPager(
                     state = yearPagerState,
-                    beyondViewportPageCount = yearPagerBeyondViewport,
+                    beyondViewportPageCount = 0,
                     flingBehavior = PagerDefaults.flingBehavior(state = yearPagerState),
                     modifier = Modifier
                         .fillMaxWidth()

shared/src/commonMain/kotlin/plus/rua/project/ui/CalendarPager.kt

@@ -67,7 +67,7 @@ fun CalendarPager(
 
     HorizontalPager(
         state = pagerState,
-        beyondViewportPageCount = 1,
+        beyondViewportPageCount = 0,
         flingBehavior = PagerDefaults.flingBehavior(state = pagerState),
         modifier = modifier
     ) { page ->

shared/src/commonMain/kotlin/plus/rua/project/ui/WeekPager.kt

@@ -66,7 +66,7 @@ fun WeekPager(
 
     HorizontalPager(
         state = pagerState,
-        beyondViewportPageCount = 1,
+        beyondViewportPageCount = 0,
         flingBehavior = PagerDefaults.flingBehavior(state = pagerState),
         modifier = modifier
     ) { page ->

shared/src/commonTest/kotlin/plus/rua/project/CalendarViewModelTest.kt

@@ -18,7 +18,6 @@ class CalendarViewModelTest {
 
     private val fixedInstant = Instant.parse("2026-05-15T00:00:00Z")
     private val testClock = FixedClock(fixedInstant)
-
     private fun createViewModel(): CalendarViewModel {
         val scope = CoroutineScope(Dispatchers.Unconfined)
         return CalendarViewModel(coroutineScope = scope, clock = testClock)