feat(timer): 循环训练组进度改为圆环分段弧 + 信息气泡三行合一

- progress-ring 新增 sets/currentSet/resting/successColor 属性,
  圆环外圈绘制分段弧(已完成=主色/当前=呼吸光点/休息下一组=绿),单组模式零渲染
- timer 删除顶部 circuit-bar 进度面板,布局骨架三模式统一
- 呼吸环淡化(描边 0.55→0.20,柔光渐变强度减半)
- 目标卡与提示气泡合并为 info-bubble,状态文案(撑住/休息中/已暂停)并入气泡顶部

pages/index/index.js

@@ -19,18 +19,11 @@ Page({
     // 空则回退占位(人形图标 + "运动达人"),settings 改完回首页即刷新。
     nickName: '',
     avatarUrl: '',
-    // 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
-    // number grows past the fixed-size circular ring and gets clipped. We
-    // cancel that scale here so the number renders at a constant visual size
-    // (matching the devtools/simulator) on every device. See _readFontScale().
-    targetTimeFontSize: 96,
     streakCount: 0,
     planName: '',
     planDay: 1,
     planTotal: 7,
-    // hero / 进度地图 / dial 相关展示字段(由 refresh 生成)
+    // hero / 进度地图 / 时长展示相关字段(由 refresh 生成)
     greetText: '你好',
     streakText: '今天开启坚持之旅',
     questNodes: [],
@@ -52,50 +45,9 @@ Page({
 
   onLoad() {
     themeMod.applyThemeToPage(this)
-    this._readFontScale()
     this._firstShow = true
   },
 
-  /**
-   * Read the device's WeChat font-size scale and compensate the ring number
-   * so it never overflows the fixed circular clip on real devices.
-   *
-   * WeChat auto-applies `fontSizeScaleFactor` to ALL text (including rpx font
-   * sizes) but leaves rpx box dimensions untouched. A user who bumps up the
-   * system font therefore sees enlarged text inside a non-enlarged ring.
-   *
-   * CRITICAL asymmetry: the DevTools simulator reports the SAME
-   * `fontSizeScaleFactor` as a real device (the user's actual WeChat setting)
-   * but does NOT actually scale rendered text. So if we compensate there, the
-   * number ends up too small in the simulator. We therefore SKIP the
-   * compensation under DevTools (host.env === 'devtools') and keep the design
-   * size — matching what the simulator renders literally.
-   *
- * On real devices, dividing our design size by the factor cancels the
- * auto-scale, keeping the number a constant 96rpx-equivalent everywhere.
-   * Bounded so a bad reading can only ever make the number smaller (safe),
-   * never larger (overflow).
-   */
-  _readFontScale() {
-    let factor = 1
-    try {
-      const info = wx.getAppBaseInfo ? wx.getAppBaseInfo() : wx.getSystemInfoSync()
-      const isDevtools = info.host && info.host.env === 'devtools'
-      if (!isDevtools) {
-        if (typeof info.fontSizeScaleFactor === 'number' && info.fontSizeScaleFactor > 0) {
-          factor = info.fontSizeScaleFactor
-        } else if (typeof info.fontSizeSetting === 'number' && info.fontSizeSetting > 0) {
-          // fontSizeScaleFactor == currentFontSize / standardFontSize(17px)
-          factor = info.fontSizeSetting / 17
-        }
-      }
-    } catch (e) {}
-    const DESIGN = 96
-    let size = Math.round(DESIGN / factor)
-    size = Math.max(48, Math.min(96, size))
-    this.setData({ targetTimeFontSize: size })
-  },
-
   onShow() {
     themeMod.applyThemeToPage(this)
     try {