feat: 排行榜虚拟领奖台 + 勋章对齐与尺寸统一

- 领奖台数据不足 3 名时显示虚拟空位(虚线轮廓+虚位以待)
- 领奖台勋章与昵称对齐改为等高盒结构性修复(移除 margin 盲推)
- 全 app 成就勋章图标尺寸统一为 30rpx(前三名/列表/设置页/记录页一致)
- 勋章 SVG 按包围盒精确居中(utils/icons.js)
- 设置页/记录页勋章展示配套调整

pages/records/records.js

@@ -156,14 +156,23 @@ Page({
   },
 
   onNextMonth() {
-    let { currentYear, currentMonth } = this.data
-    if (currentMonth === 12) {
-      currentYear++
-      currentMonth = 1
-    } else {
-      currentMonth++
+    const { currentYear, currentMonth } = this.data
+    // 计算下一月
+    let nextYear = currentYear
+    let nextMonth = currentMonth + 1
+    if (nextMonth > 12) {
+      nextYear++
+      nextMonth = 1
     }
-    this.setData({ currentYear, currentMonth })
+    // 上限:不能翻到未来月份。当前月是最新有数据的月份,再往后无意义。
+    const now = new Date()
+    const nowYear = now.getFullYear()
+    const nowMonth = now.getMonth() + 1
+    if (nextYear > nowYear || (nextYear === nowYear && nextMonth > nowMonth)) {
+      wx.showToast({ title: '已经是最新月份', icon: 'none', duration: 1200 })
+      return
+    }
+    this.setData({ currentYear: nextYear, currentMonth: nextMonth })
     this.refresh()
   },
 
@@ -216,7 +225,7 @@ Page({
     // 日期部分,直接 === 永远不匹配,必须用 dateOnly 截取后再比。
     const sessions = allRecords.filter(r => util.dateOnly(r.date) === dateStr)
     const totalDur = sessions.reduce((sum, r) => sum + r.duration, 0)
-    const calories = Math.round(totalDur * 0.068)
+    const calories = Math.round(totalDur * (config.caloriesPerSecond || 0.068))
     this.setData({
       showDayDetail: true,
       dayDetail: {