feat: 训练完成全屏弹窗 (大数字+countUp+超时+3按钮)

替换原来不显眼的 wx.showToast:
- 全屏遮罩 + 大圆角卡片,scale-in 弹性入场
- 大数字 180rpx countUp 从 0 滚到实际秒数(1.2s)
- 超时标签 +Xs 秒超时(OvertimePop 弹性出现,延迟 1.1s 等数字到末尾)
- 连续打卡显示 🔥
- 3 按钮:再来一次(留在当前页重置) / 查看记录(跳记录页) / 回到首页
- 装饰 emoji 圆形 1.6s 循环脉冲
- onComplete 触发时自动保存,不需要再手动点结束

pages/timer/timer.js

@@ -23,6 +23,14 @@ Page({
     celebrationLevel: 'normal',  // normal / first / milestone / record
     celebrationMessage: '',
     confettiPieces: [],
+    // Completion modal (full-screen summary after training ends)
+    showCompletion: false,
+    completionElapsed: 0,
+    completionTarget: 0,
+    completionOvertime: 0,
+    completionStreak: 0,
+    completionLevel: 'normal',
+    completionMessage: '',
     icons: iconsMod.build()
   },
 
@@ -96,24 +104,15 @@ Page({
       },
       onComplete: () => {
         const elapsed = this._timer.elapsed
-        const { level, message } = this._detectCelebrationLevel(elapsed)
-        const confettiPieces = this._buildConfettiPieces(level)
-        this.setData({
-          status: 'completed',
-          isCompleted: true,
-          celebrationLevel: level,
-          celebrationMessage: message,
-          confettiPieces
-        })
         const s = storage.getSettings()
         if (s.vibrate) {
           try { wx.vibrateLong() } catch (e) {}
         }
-        // 4th voice prompt: completion
         if (s.voiceGuide !== false) {
           voice.play('complete')
         }
-        wx.showToast({ title: '目标完成! 太棒了!', icon: 'success', duration: 2000 })
+        // Auto-save + show big completion modal
+        this._saveAndShowCompletion(elapsed)
       }
     })
   },
@@ -271,8 +270,9 @@ Page({
   },
 
   finishTraining() {
-    // Guard against double-tap: stop button is still visible during the
-    // 1.5s navigateBack delay, so a second tap would create a duplicate.
+    // Guard against double-tap: completion modal shows immediately, so
+    // a second tap on the underlying 结束 button is harmless — but we
+    // still need to guard the save itself.
     if (this._saving) return
     this._saving = true
 
@@ -283,6 +283,20 @@ Page({
       setTimeout(() => { wx.navigateBack() }, 1500)
       return
     }
+    this._saveAndShowCompletion(elapsed)
+  },
+
+  /**
+   * Persist the just-finished training and pop the big completion modal.
+   * Called from both onComplete (natural finish) and finishTraining
+   * (user ended early). Detection of "first / record / milestone" uses
+   * pre-save stats so the level is decided before the data changes.
+   */
+  _saveAndShowCompletion(elapsed) {
+    const { level, message } = this._detectCelebrationLevel(elapsed)
+    const confettiPieces = this._buildConfettiPieces(level)
+
+    // Save record + streak
     const today = storage.getToday()
     storage.saveRecord({
       date: today,
@@ -292,11 +306,80 @@ Page({
     })
     storage.updateStreak(today)
 
-    // Flag the just-completed training so the index page can briefly
-    // highlight the "今日已完成" badge when the user lands back there.
+    // Flag for the index page's "训练完成" highlight
     try { wx.setStorageSync('_last_train_at', Date.now()) } catch (e) {}
 
-    wx.showToast({ title: `已记录 ${elapsed}秒`, icon: 'none', duration: 1500 })
-    setTimeout(() => { wx.navigateBack() }, 1500)
+    const finalStreak = storage.getStreak().count
+
+    this.setData({
+      // Background effects keep playing behind the modal
+      status: 'completed',
+      isCompleted: true,
+      celebrationLevel: level,
+      celebrationMessage: message,
+      confettiPieces,
+      // Modal state
+      showCompletion: true,
+      completionElapsed: 0,
+      completionTarget: this.data.duration,
+      completionOvertime: Math.max(0, elapsed - this.data.duration),
+      completionStreak: finalStreak,
+      completionLevel: level,
+      completionMessage: message
+    })
+
+    // Animate the big number from 0 to elapsed
+    if (this._completionCountUp) this._completionCountUp.cancel()
+    this._completionCountUp = countUp({
+      from: 0,
+      to: elapsed,
+      duration: 1200,
+      onUpdate: (v) => this.setData({ completionElapsed: v }),
+      onComplete: () => { this._completionCountUp = null }
+    })
+  },
+
+  onCloseCompletion() {
+    if (this._completionCountUp) {
+      this._completionCountUp.cancel()
+      this._completionCountUp = null
+    }
+    this.setData({ showCompletion: false })
+    setTimeout(() => { wx.navigateBack() }, 280)
+  },
+
+  onViewRecords() {
+    if (this._completionCountUp) {
+      this._completionCountUp.cancel()
+      this._completionCountUp = null
+    }
+    this.setData({ showCompletion: false })
+    setTimeout(() => {
+      wx.navigateBack({
+        success: () => {
+          setTimeout(() => wx.switchTab({ url: '/pages/records/records' }), 100)
+        }
+      })
+    }, 280)
+  },
+
+  onTrainAgain() {
+    // Reset the timer to idle so the user can start a new session right
+    // here (no need to navigate back and re-tap 开始).
+    if (this._completionCountUp) {
+      this._completionCountUp.cancel()
+      this._completionCountUp = null
+    }
+    this.setData({
+      showCompletion: false,
+      isCompleted: false,
+      status: 'idle',
+      isRunning: false,
+      isPaused: false,
+      remaining: this.data.duration,
+      overtime: 0,
+      // Re-init countUp so the big number rolls again on next start
+      _countUpTask: null
+    })
   }
 })