修复趋势图表加载与比例展示

components/trend-chart/trend-chart.js

@@ -1,3 +1,5 @@
+const { getBarPercent } = require('../../utils/util')
+
 /**
  * Trend bar chart - pure CSS (no canvas), matches the calendar-heatmap's
  * rendering approach for consistency.
@@ -8,8 +10,8 @@
  *   - valueText:  formatted string shown above the bar (e.g. "1分30秒")
  *   - highlight:  truthy -> theme glow + bold label (today / this month)
  *
- * Bar height is value/max*100%, with an 8% floor for any non-zero value so
- * short sessions stay visible. Zero values render a faint stub.
+ * Bar height is strictly proportional to value/max. Zero values render a
+ * faint stub so empty dates remain visible without distorting the data.
  */
 Component({
   properties: {
@@ -39,7 +41,7 @@ Component({
           value: v,
           valueText: (d && d.valueText) || '',
           highlight: !!(d && d.highlight),
-          percent: max > 0 ? Math.max((v / max) * 100, v > 0 ? 8 : 0) : 0
+          percent: getBarPercent(v, max)
         }
       })
       this.setData({ bars })