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/Me/CustomMetricsListView.swift

@@ -18,11 +18,16 @@ struct CustomMetricsListView: View {
                 if metrics.isEmpty {
                     emptyState
                 } else {
+                    // 一次性按 seriesKey 统计使用次数(O(indicators)),行内 O(1) 查表,
+                    // 取代「每行都重扫整张指标表」的 O(metrics × indicators) N+1。
+                    let usageCounts: [String: Int] = indicators.reduce(into: [:]) { acc, ind in
+                        if let key = ind.seriesKey, !key.isEmpty { acc[key, default: 0] += 1 }
+                    }
                     ForEach(metrics) { m in
                         Button {
                             editingTarget = CustomMetricEditTarget(metric: m)
                         } label: {
-                            row(m)
+                            row(m, usage: usageCounts[m.seriesKey] ?? 0)
                         }
                         .buttonStyle(.plain)
                     }
@@ -82,9 +87,8 @@ struct CustomMetricsListView: View {
         .frame(maxWidth: .infinity)
     }
 
-    private func row(_ m: CustomMonitorMetric) -> some View {
-        let count = usageCount(for: m)
-        return HStack(spacing: 12) {
+    private func row(_ m: CustomMonitorMetric, usage count: Int) -> some View {
+        HStack(spacing: 12) {
             ZStack {
                 Circle().fill(Tj.Palette.leafSoft)
                 Image(systemName: m.icon)
@@ -137,9 +141,6 @@ struct CustomMetricsListView: View {
         )
     }
 
-    private func usageCount(for m: CustomMonitorMetric) -> Int {
-        indicators.filter { $0.seriesKey == m.seriesKey }.count
-    }
 }
 
 #Preview {

康康/Features/Me/CustomReminderEditSheet.swift

@@ -27,6 +27,7 @@ struct CustomReminderEditSheet: View {
     @State private var month = 1
     @State private var hydrated = false
     @State private var showAuthDeniedAlert = false
+    @State private var showDeleteConfirm = false
 
     /// 常用时间快捷预设(时, 分):早 / 午 / 傍晚 / 睡前。
     private let timePresets: [(h: Int, m: Int)] = [(8, 0), (12, 0), (18, 0), (22, 0)]
@@ -79,7 +80,7 @@ struct CustomReminderEditSheet: View {
 
                 if isEditing {
                     Section {
-                        Button(role: .destructive) { deleteReminder() } label: {
+                        Button(role: .destructive) { showDeleteConfirm = true } label: {
                             Label(String(appLoc: "删除提醒"), systemImage: "trash")
                         }
                     }
@@ -110,6 +111,12 @@ struct CustomReminderEditSheet: View {
             } message: {
                 Text("提醒已保存,但系统通知权限未开启,到点不会弹出。请在「设置 · 通知 · 康康」中允许。")
             }
+            .alert(String(appLoc: "删除这条提醒?"), isPresented: $showDeleteConfirm) {
+                Button(String(appLoc: "删除"), role: .destructive) { deleteReminder() }
+                Button(String(appLoc: "取消"), role: .cancel) { }
+            } message: {
+                Text("删除后该提醒不再触发。")
+            }
         }
     }