Add debug logging and fix gridHeightPx derivedStateOf state tracking

gridHeightPx changed from derivedStateOf to direct computation because
derivedStateOf cannot track non-State local variable changes, causing
gridHeightPx to not update when rowHeightPx transitions from 0 to measured value.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

shared/src/commonMain/kotlin/plus/rua/project/CalendarViewModel.kt

@@ -47,12 +47,14 @@ class CalendarViewModel(private val coroutineScope: CoroutineScope) {
     val currentMonth: Int get() = selectedDate.month.number
 
     fun selectDate(date: LocalDate) {
+        println("CalendarViewModel: selectDate $date (was $selectedDate)")
         selectedDate = date
     }
 
     fun onDrag(delta: Float) {
         coroutineScope.launch {
             val new = (_collapseAnimatable.value + delta).coerceIn(0f, 1f)
+            println("CalendarViewModel: onDrag delta=$delta, progress=${_collapseAnimatable.value} -> $new")
             _collapseAnimatable.snapTo(new)
         }
     }
@@ -61,17 +63,20 @@ class CalendarViewModel(private val coroutineScope: CoroutineScope) {
     fun onDragEnd() {
         coroutineScope.launch {
             val current = _collapseAnimatable.value
+            println("CalendarViewModel: onDragEnd current=$current, threshold=$COLLAPSE_THRESHOLD")
             if (current > COLLAPSE_THRESHOLD) {
                 _collapseAnimatable.animateTo(
                     targetValue = 1f,
                     animationSpec = spring(dampingRatio = 0.8f, stiffness = 400f)
                 )
                 isCollapsed = true
+                println("CalendarViewModel: collapsed=true")
             } else {
                 _collapseAnimatable.animateTo(
                     targetValue = 0f,
                     animationSpec = spring(dampingRatio = 0.8f, stiffness = 400f)
                 )
+                println("CalendarViewModel: snapped back to 0f")
             }
         }
     }
@@ -80,6 +85,7 @@ class CalendarViewModel(private val coroutineScope: CoroutineScope) {
     fun onExpandDrag(delta: Float) {
         coroutineScope.launch {
             val new = (_collapseAnimatable.value + delta).coerceIn(0f, 1f)
+            println("CalendarViewModel: onExpandDrag delta=$delta, progress=${_collapseAnimatable.value} -> $new")
             _collapseAnimatable.snapTo(new)
         }
     }
@@ -88,17 +94,20 @@ class CalendarViewModel(private val coroutineScope: CoroutineScope) {
     fun onExpandDragEnd() {
         coroutineScope.launch {
             val current = _collapseAnimatable.value
+            println("CalendarViewModel: onExpandDragEnd current=$current, threshold=$COLLAPSE_THRESHOLD")
             if (current < COLLAPSE_THRESHOLD) {
                 _collapseAnimatable.animateTo(
                     targetValue = 0f,
                     animationSpec = spring(dampingRatio = 0.8f, stiffness = 400f)
                 )
                 isCollapsed = false
+                println("CalendarViewModel: expanded=false")
             } else {
                 _collapseAnimatable.animateTo(
                     targetValue = 1f,
                     animationSpec = spring(dampingRatio = 0.8f, stiffness = 400f)
                 )
+                println("CalendarViewModel: snapped back to 1f")
             }
         }
     }

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

@@ -33,6 +33,7 @@ fun BottomCard(
 ) {
     val density = LocalDensity.current
     val dragRange = with(density) { DRAG_RANGE_DP.dp.toPx() }
+    println("BottomCard: isCollapsed=${viewModel.isCollapsed}, dragRange=$dragRange, progress=${viewModel.collapseProgress}")
 
     Surface(
         modifier = modifier

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

@@ -115,7 +115,10 @@ fun CalendarMonthPage(
                         .then(
                             if (weekIndex == 0 && rowHeightPx == 0) {
                                 Modifier.onSizeChanged { size ->
-                                    if (size.height > 0) onRowHeightMeasured?.invoke(size.height)
+                                    if (size.height > 0) {
+                                        println("CalendarMonthPage: measured rowHeight=${size.height}px, reporting to parent")
+                                        onRowHeightMeasured?.invoke(size.height)
+                                    }
                                 }
                             } else Modifier
                         )

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

@@ -31,6 +31,8 @@ import kotlin.math.abs
 import kotlin.time.Clock
 import plus.rua.project.CalendarViewModel
 
+private const val TAG = "CalendarMonthView"
+
 /**
  * 日历主界面，包含月/周视图切换和折叠动画。
  *
@@ -59,8 +61,10 @@ fun CalendarMonthView(
     val pagerState = rememberPagerState(initialPage = START_PAGE, pageCount = { Int.MAX_VALUE })
 
     val p = viewModel.collapseProgress
+    println("$TAG: collapseProgress=$p, isCollapsed=${viewModel.isCollapsed}")
     val headerHeightPx = monthHeaderHeightPx + weekdayHeaderHeightPx
     val rowPaddingPx = with(density) { ROW_PADDING_DP.dp.toPx() }.toInt()
+    println("$TAG: headerHeightPx=$headerHeightPx (month=$monthHeaderHeightPx, weekday=$weekdayHeaderHeightPx), rowPaddingPx=$rowPaddingPx")
 
     val interpolatedWeeks by remember {
         derivedStateOf {
@@ -85,27 +89,28 @@ fun CalendarMonthView(
         (cellWidth + rowPadding).toInt()
     } else 0
 
+    println("$TAG: screenWidthPx=$screenWidthPx, screenHeightPx=$screenHeightPx, estimatedRowHeightPx=$estimatedRowHeightPx, measuredRowHeightPx=$rowHeightPx")
+
     val effectiveRowHeightPx = if (rowHeightPx > 0) rowHeightPx else estimatedRowHeightPx
 
     // 折叠时网格高度公式（与 CalendarMonthPage 一致）：
     // gridH = rowH × (1 + (weeks-1) × (1-p))
     val effectiveWeeks = interpolatedWeeks
 
-    val gridHeightPx by remember {
+    // gridHeightPx 必须直接计算而非 derivedStateOf，因为 effectiveRowHeightPx 依赖 rowHeightPx state，
-        derivedStateOf {
+    // derivedStateOf 无法追踪非 State 的局部变量变化，导致 rowHeightPx 从 0 变为测量值时 gridHeightPx 不更新
-            if (effectiveRowHeightPx > 0) {
+    val gridHeightPx = if (effectiveRowHeightPx > 0) {
-                val rowH = effectiveRowHeightPx.toFloat()
+        val rowH = effectiveRowHeightPx.toFloat()
-                if (p > OFFSET_FRACTION_THRESHOLD) {
+        if (p > OFFSET_FRACTION_THRESHOLD) {
-                    (rowH * (1 + (effectiveWeeks - 1) * (1f - p))).toInt()
+            (rowH * (1 + (effectiveWeeks - 1) * (1f - p))).toInt()
-                } else {
+        } else {
-                    (rowH * effectiveWeeks).toInt()
+            (rowH * effectiveWeeks).toInt()
-                }
-            } else 0
         }
-    }
+    } else 0
 
     val calendarAreaHeightPx = headerHeightPx + gridHeightPx + rowPaddingPx
     val cardHeightPx = if (screenHeightPx > 0 && calendarAreaHeightPx > 0) screenHeightPx - calendarAreaHeightPx else 0
+    println("$TAG: effectiveRowHeightPx=$effectiveRowHeightPx, effectiveWeeks=$effectiveWeeks, gridHeightPx=$gridHeightPx, calendarAreaHeightPx=$calendarAreaHeightPx, cardHeightPx=$cardHeightPx")
 
     // 当 rowHeightPx 已知时，用计算的高度约束 pager；否则让 pager 自由扩展以测量行高
     val pagerModifier = if (rowHeightPx > 0 && gridHeightPx > 0) {
@@ -141,6 +146,7 @@ fun CalendarMonthView(
             )
             // 完全折叠且无动画时显示 WeekPager，否则显示 CalendarPager（含下拉恢复过程）
             if (viewModel.isCollapsed && viewModel.collapseProgress >= 1f) {
+                println("$TAG: Showing WeekPager (isCollapsed=true, progress=${viewModel.collapseProgress})")
                 WeekPager(
                     selectedDate = viewModel.selectedDate,
                     today = today,
@@ -152,6 +158,7 @@ fun CalendarMonthView(
                     }
                 )
             } else {
+                println("$TAG: Showing CalendarPager (isCollapsed=${viewModel.isCollapsed}, progress=${viewModel.collapseProgress})")
                 CalendarPager(
                     selectedDate = viewModel.selectedDate,
                     today = today,
@@ -174,6 +181,7 @@ fun CalendarMonthView(
         }
 
         if (cardHeightPx > 0) {
+            println("$TAG: BottomCard height=${with(density) { cardHeightPx.toDp() }}")
             BottomCard(
                 viewModel = viewModel,
                 modifier = Modifier