feat(index): 首页随机姿势提示 + 移除冗余文案

- homeTip 从 config.postureTips 随机取一条，每次进首页换一条
- 移除圆环下方"平板支撑"单位文字，调整 ring 间距

pages/index/index.js

@@ -15,6 +15,7 @@ Page({
     todayDone: false,
     todayDuration: 0,
     todayTargetText: '',
+    homeTip: '',
     // Ring number font size in rpx. WeChat auto-scales text by the user's
     // font-size setting (fontSizeScaleFactor) but does NOT scale rpx box
     // dimensions — so on a real device with enlarged system font the 84rpx
@@ -147,6 +148,10 @@ Page({
     // 分段格子(每天一格)只在计划天数 <= 10 时用;更长则退化为里程碑连续条,避免格子过密
     const useSegments = plan.totalDays > 0 && plan.totalDays <= 10
     const planDays = useSegments ? Array.from({ length: plan.totalDays }, (_, i) => i) : []
+    // 首页姿势要领:从 config.postureTips 随机取一条,每次刷新都换,
+    // 让用户反复进首页能看到不同要领。配置为空时回退到默认文案,避免空白。
+    const tips = config.postureTips || []
+    const homeTip = tips.length ? tips[Math.floor(Math.random() * tips.length)] : '保持身体成一条直线，核心收紧，均匀呼吸'
     this.setData({
       theme,
       icons: iconsMod.build(theme),
@@ -160,7 +165,8 @@ Page({
       planTotal: plan.totalDays,
       planProgress,
       useSegments,
-      planDays
+      planDays,
+      homeTip
     })
   },
 

pages/index/index.wxml

@@ -64,7 +64,6 @@
         <view class="target-ring">
           <text class="target-time" style="font-size: {{targetTimeFontSize}}rpx;">{{todayTargetText}}</text>
         </view>
-        <text class="target-unit">平板支撑</text>
       </view>
       <view class="today-status">
         <block wx:if="{{todayDone}}">
@@ -106,7 +105,7 @@
   <ui-card variant="soft" padded="{{false}}">
     <view class="tip-card">
       <image class="tip-icon" src="{{icons.lightFill}}" mode="aspectFit"></image>
-      <text class="tip-text">保持身体成一条直线，核心收紧，均匀呼吸</text>
+      <text class="tip-text">{{homeTip}}</text>
     </view>
   </ui-card>
 

pages/index/index.wxss

@@ -249,7 +249,6 @@
   background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.10), rgba(var(--primary-rgb), 0.03));
   border: 6rpx solid rgba(var(--primary-rgb), 0.18);
   box-shadow: 0 0 0 14rpx rgba(var(--primary-rgb), 0.05);
-  margin-bottom: 20rpx;
   overflow: hidden;
 }
 
@@ -266,14 +265,6 @@
   overflow: hidden;
 }
 
-.target-unit {
-  display: block;
-  font-size: 26rpx;
-  color: var(--text-secondary);
-  margin-top: 4rpx;
-  line-height: 1;
-}
-
 .today-status {
   margin-top: 16rpx;
   display: flex;