根据提供的code differences信息，由于没有具体的代码变更内容，我将生成一个通用的commit message模板：

```
docs(readme): 更新文档说明

- 添加了项目使用指南
- 完善了API接口说明
- 修正了一些文字错误
```

注：由于未提供具体的代码差异信息，以上为示例格式。请提供具体的代码变更内容以便生成准确的commit message。

康康/Features/Home/HomeCalendarCard.swift

@@ -46,8 +46,8 @@ struct HomeCalendarCard: View {
         return (0..<7).compactMap { calendar.date(byAdding: .day, value: $0, to: monday) }
     }
 
-    /// 本月有记录的天数(指标/报告/日记/症状任一)。
-    private var daysWithRecordsThisMonth: Int {
+    /// 本月有记录的天数(指标/报告/日记/症状任一)。传入已构建好的 data,避免逐天重建。
+    private func daysWithRecordsThisMonth(_ data: CalendarData) -> Int {
         guard let interval = calendar.dateInterval(of: .month, for: .now) else { return 0 }
         let count = calendar.range(of: .day, in: .month, for: .now)?.count ?? 30
         var n = 0
@@ -62,9 +62,11 @@ struct HomeCalendarCard: View {
     }
 
     var body: some View {
-        VStack(alignment: .leading, spacing: 12) {
-            header
-            weekStrip
+        // CalendarData 一次性构建,供周条 + 本月摘要复用 —— 杜绝逐格(7)+ 逐天(~30)反复全表重建。
+        let calData = data
+        return VStack(alignment: .leading, spacing: 12) {
+            header(calData)
+            weekStrip(calData)
         }
         .padding(14)
         .frame(maxWidth: .infinity, alignment: .leading)
@@ -77,14 +79,14 @@ struct HomeCalendarCard: View {
         }
     }
 
-    private var header: some View {
+    private func header(_ data: CalendarData) -> some View {
         HStack(alignment: .firstTextBaseline) {
             Text("健康日历")
                 .font(.tjH2())
                 .foregroundStyle(Tj.Palette.text)
             Spacer()
             HStack(spacing: 3) {
-                Text(summaryLine)
+                Text(summaryLine(data))
                     .font(.tjScaled( 12))
                     .foregroundStyle(Tj.Palette.text3)
                 Image(systemName: "chevron.right")
@@ -94,20 +96,20 @@ struct HomeCalendarCard: View {
         }
     }
 
-    private var summaryLine: String {
-        let n = daysWithRecordsThisMonth
+    private func summaryLine(_ data: CalendarData) -> String {
+        let n = daysWithRecordsThisMonth(data)
         return n > 0 ? String(appLoc: "本月 \(n) 天有记录") : String(appLoc: "本月暂无记录")
     }
 
-    private var weekStrip: some View {
+    private func weekStrip(_ data: CalendarData) -> some View {
         HStack(spacing: 6) {
             ForEach(weekDays, id: \.self) { day in
-                dayCell(day)
+                dayCell(day, data)
             }
         }
     }
 
-    private func dayCell(_ day: Date) -> some View {
+    private func dayCell(_ day: Date, _ data: CalendarData) -> some View {
         let marks = data.marks(for: day, calendar: calendar)
         let ranges = data.ranges(touching: day, calendar: calendar)
         let isToday = calendar.isDateInToday(day)