feat(timer): 训练超时与完成展示优化 (v3.0)

- 超时后圆环底环变绿,中心改显总训练时长(MM:SS 实时涨),移除 +Xs 小徽章
- 完成弹窗成绩由纯秒数改为分秒(如 1分23秒),>=60s 时缩字号防撑破卡片
- 修复结束确认弹窗停留期间计时器未暂停导致训练时长虚增:onStop 暂停、取消恢复、确认取暂停值
- progress-ring 新增 elapsed prop,remaining=0 时中心切显总时长
- 清理废弃的 overtime 字段与 .overtime-badge 样式
- 版本号 v2.9 -> v3.0,更新日期

Co-Authored-By: Claude <noreply@anthropic.com>

pages/timer/timer.js

@@ -16,7 +16,7 @@ Page({
     isRunning: false,
     isPaused: false,
     isCompleted: false,
-    overtime: 0,
+    elapsed: 0,
     goalReached: false,
     hintTip: (config.postureTips && config.postureTips[0]) || '',
     todayTarget: 0,
@@ -82,7 +82,8 @@ Page({
       todayTarget: target,
       planDay: isFreeMode ? 0 : planDay,
       isFreeMode,
-      goalReached: false
+      goalReached: false,
+      elapsed: 0
     })
 
     if (this._timer) {
@@ -104,7 +105,7 @@ Page({
       onTick: (tick) => {
         this.setData({
           remaining: tick.remaining > 0 ? tick.remaining : 0,
-          overtime: tick.remaining <= 0 ? tick.elapsed - this.data.duration : 0
+          elapsed: tick.elapsed
         })
         this._updateHintTip(tick)
         this._remind(tick)
@@ -321,11 +322,24 @@ Page({
     // 用自定义确认弹窗替代 wx.showModal:
     // 系统原生 modal 在 WebView stacking context 下 hit-test 偶发不稳,
     // 自定义 modal + catchtouchmove 与现有 completion-mask 同模式,行为更可靠。
-    this.setData({ showStopConfirm: true })
+    // 弹窗停留期间暂停计时,避免犹豫时间被计入训练时长
+    this._stopWasPaused = this.data.isPaused
+    const patch = { showStopConfirm: true }
+    if (this.data.isRunning && !this.data.isPaused) {
+      this._timer.pause()
+      patch.isPaused = true
+      patch.status = 'paused'
+    }
+    this.setData(patch)
   },
 
   onStopCancel() {
     this.setData({ showStopConfirm: false })
+    // 弹窗前若正在计时(被 onStop 暂停),取消后恢复
+    if (!this._stopWasPaused && this.data.isRunning) {
+      this._timer.resume()
+      this.setData({ isRunning: true, isPaused: false, status: 'running' })
+    }
   },
 
   onStopConfirm() {
@@ -462,7 +476,7 @@ Page({
       isRunning: false,
       isPaused: false,
       remaining: this.data.duration,
-      overtime: 0,
+      elapsed: 0,
       goalReached: false
     })
   },