修复趋势图表加载与比例展示

pages/records/records.js

@@ -168,46 +168,7 @@ Page({
    * 返回 [{ label, value, valueText, highlight }] 供 trend-chart 渲染。
    */
   _computeTrend(mode) {
-    const allRecords = Object.values(storage.getRecords()).flat()
-    const today = new Date()
-    const weekdays = ['日', '一', '二', '三', '四', '五', '六']
-    const pad = (n) => String(n).padStart(2, '0')
-
-    if (mode === 'month') {
-      const data = []
-      for (let i = 5; i >= 0; i--) {
-        const d = new Date(today.getFullYear(), today.getMonth() - i, 1)
-        const monthKey = `${d.getFullYear()}-${pad(d.getMonth() + 1)}`
-        const monthRecords = storage.getRecordsByMonth(monthKey) || []
-        const total = monthRecords.reduce((s, r) => s + (Number(r.duration) || 0), 0)
-        data.push({
-          label: `${d.getMonth() + 1}月`,
-          value: total,
-          valueText: total > 0 ? util.formatDuration(total) : '',
-          highlight: i === 0
-        })
-      }
-      return data
-    }
-
-    // default: week (近 7 天)
-    const data = []
-    for (let i = 6; i >= 0; i--) {
-      const d = new Date(today)
-      d.setDate(d.getDate() - i)
-      const dateStr = `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}`
-      const total = allRecords
-        .filter((r) => util.dateOnly(r.date) === dateStr)
-        .reduce((s, r) => s + (Number(r.duration) || 0), 0)
-      const isToday = i === 0
-      data.push({
-        label: isToday ? '今天' : weekdays[d.getDay()],
-        value: total,
-        valueText: total > 0 ? util.formatDuration(total) : '',
-        highlight: isToday
-      })
-    }
-    return data
+    return util.getTrendData(storage.getRecords(), mode)
   },
 
   onDayTap(e) {