Replace year view month cells with mini calendar grids

Each month in the 4x3 year grid now shows a compact calendar with
day numbers, matching the iOS Calendar year view style. Today is
highlighted with a filled circle. Selected month title uses primary color.

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

@@ -246,6 +246,7 @@ fun CalendarMonthView(
             YearGridView(
                 year = viewModel.yearViewYear,
                 selectedMonth = if (viewModel.yearViewYear == currentYear) currentMonth else 0,
+                today = today,
                 onMonthClick = { month ->
                     viewModel.selectMonthFromYearView(month)
                     // 同步 CalendarPager 到目标月份

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

@@ -5,8 +5,6 @@ import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.aspectRatio
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
@@ -14,6 +12,7 @@ import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
@@ -23,9 +22,18 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import kotlinx.datetime.DatePeriod
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.minus
+import kotlinx.datetime.number
+import kotlinx.datetime.plus
+import kotlinx.datetime.todayIn
 
 /**
- * 年度网格视图，显示 4×3 月份网格，支持年份切换。
+ * 年度网格视图，显示 4×3 精简月历网格，支持年份切换。
+ *
+ * 每格显示一个精简版月历（月份标题 + 日期数字网格），
+ * 选中月份高亮，点击进入该月。
  *
  * @param year 显示的年份
  * @param selectedMonth 当前选中月份（1-12）
@@ -37,6 +45,7 @@ import androidx.compose.ui.unit.sp
 fun YearGridView(
     year: Int,
     selectedMonth: Int,
+    today: LocalDate,
     onMonthClick: (Int) -> Unit,
     onYearChange: (Int) -> Unit,
     modifier: Modifier = Modifier
@@ -62,13 +71,13 @@ fun YearGridView(
                     .clickable { onYearChange(year - 1) }
                     .padding(horizontal = 16.dp, vertical = 8.dp)
             )
-            Spacer(modifier = Modifier.weight(1f))
+            Box(modifier = Modifier.weight(1f), contentAlignment = Alignment.Center) {
                 Text(
                     text = "${year}年",
                     style = MaterialTheme.typography.titleLarge,
                     fontWeight = FontWeight.Bold
                 )
-            Spacer(modifier = Modifier.weight(1f))
+            }
             Text(
                 text = "›",
                 fontSize = 24.sp,
@@ -81,12 +90,12 @@ fun YearGridView(
             )
         }
 
-        // 4×3 月份网格
+        // 4×3 月历网格
         Column(
             modifier = Modifier
                 .fillMaxWidth()
                 .weight(1f)
-                .padding(horizontal = 16.dp),
+                .padding(horizontal = 8.dp),
             verticalArrangement = Arrangement.SpaceEvenly
         ) {
             (0 until 4).forEach { row ->
@@ -96,9 +105,11 @@ fun YearGridView(
                 ) {
                     (0 until 3).forEach { col ->
                         val month = row * 3 + col + 1
-                        MonthCell(
+                        MiniMonth(
+                            year = year,
                             month = month,
                             isSelected = month == selectedMonth,
+                            today = today,
                             onClick = { onMonthClick(month) },
                             modifier = Modifier.weight(1f)
                         )
@@ -110,45 +121,106 @@ fun YearGridView(
 }
 
 /**
- * 年视图中的月份单元格。
+ * 精简版月历：月份标题 + 日期数字网格。
  */
 @Composable
-private fun MonthCell(
+private fun MiniMonth(
+    year: Int,
     month: Int,
     isSelected: Boolean,
+    today: LocalDate,
     onClick: () -> Unit,
     modifier: Modifier = Modifier
 ) {
-    val contentColor = if (isSelected) {
+    val days = remember(year, month) { generateMiniMonthDays(year, month) }
-        MaterialTheme.colorScheme.onPrimary
+    val titleColor = if (isSelected) {
+        MaterialTheme.colorScheme.primary
     } else {
         MaterialTheme.colorScheme.onSurface
     }
-    val bgColor = MaterialTheme.colorScheme.primary
+    val dayColor = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.6f)
+    val otherMonthColor = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.2f)
+    val todayBgColor = MaterialTheme.colorScheme.primary
 
-    Box(
+    Column(
         modifier = modifier
-            .aspectRatio(1f)
+            .padding(2.dp)
-            .padding(6.dp)
             .clip(CircleShape)
+            .clickable(onClick = onClick)
+            .padding(vertical = 4.dp),
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        // 月份标题
+        Text(
+            text = "${month}月",
+            color = titleColor,
+            fontSize = 10.sp,
+            fontWeight = if (isSelected) FontWeight.Bold else FontWeight.Normal,
+            textAlign = TextAlign.Center
+        )
+        // 日期网格
+        days.chunked(7).forEach { week ->
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.SpaceEvenly
+            ) {
+                week.forEach { dayData ->
+                    val isToday = dayData.date == today
+                    val color = when {
+                        !dayData.isCurrentMonth -> otherMonthColor
+                        isToday -> MaterialTheme.colorScheme.primary
+                        else -> dayColor
+                    }
+                    Box(
+                        contentAlignment = Alignment.Center
+                    ) {
+                        if (isToday) {
+                            Box(
+                                modifier = Modifier
                                     .drawBehind {
-                if (isSelected) {
                                         drawCircle(
-                        color = bgColor,
+                                            color = todayBgColor,
                                             radius = size.minDimension / 2f,
                                             center = Offset(size.width / 2f, size.height / 2f)
                                         )
                                     }
+                                    .clip(CircleShape)
+                            )
                         }
-            .clickable(onClick = onClick),
-        contentAlignment = Alignment.Center
-    ) {
                         Text(
-            text = "${month}月",
+                            text = if (dayData.isCurrentMonth) dayData.date.day.toString() else "",
-            color = contentColor,
+                            color = if (isToday) MaterialTheme.colorScheme.onPrimary else color,
-            fontSize = 16.sp,
+                            fontSize = 7.sp,
-            fontWeight = if (isSelected) FontWeight.Bold else FontWeight.Normal,
+                            textAlign = TextAlign.Center,
-            textAlign = TextAlign.Center
+                            lineHeight = 10.sp
+                        )
+                    }
+                }
+            }
+        }
+    }
+}
+
+private data class MiniDayData(
+    val date: LocalDate,
+    val isCurrentMonth: Boolean
+)
+
+@Suppress("DEPRECATION") // monthNumber 无替代 API
+private fun generateMiniMonthDays(year: Int, month: Int): List<MiniDayData> {
+    val firstOfMonth = LocalDate(year, month, 1)
+    val offset = firstOfMonth.dayOfWeek.ordinal
+    val startDate = firstOfMonth.minus(DatePeriod(days = offset))
+    val nextMonth = if (month == 12) LocalDate(year + 1, 1, 1) else LocalDate(year, month + 1, 1)
+    val daysInMonth = nextMonth.minus(DatePeriod(days = 1)).day
+    val rows = ((offset + daysInMonth - 1) / 7) + 1
+    val totalDays = rows * 7
+
+    return (0 until totalDays).map { i ->
+        val date = startDate.plus(DatePeriod(days = i))
+        MiniDayData(
+            date = date,
+            isCurrentMonth = date.month.number == month && date.year == year
         )
     }
 }