feat(timer): 训练到目标时长不再自动结束,支持超长发挥

- Timer: 到时间触发 onGoalReached(提示)而非自动结束,elapsed/overtime
  继续累加直到用户手动停止
- timer: onGoalReached 播 goal 语音 + goalReached 状态;finishTraining
  补 complete 语音;完成弹窗显示"超长发挥 +X 秒"
- wxml: 超时 badge 训练中也显示;新增 goalReached hint 分支
- voice/tts: 新增 goal 语音 prompt(需部署 tts 云函数)
- config: 版本号 v2.5 -> v2.6

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

pages/timer/timer.js

@@ -17,6 +17,7 @@ Page({
     isPaused: false,
     isCompleted: false,
     overtime: 0,
+    goalReached: false,
     todayTarget: 0,
     planDay: 1,
     isFreeMode: false,
@@ -79,7 +80,8 @@ Page({
       remaining: target,
       todayTarget: target,
       planDay: isFreeMode ? 0 : planDay,
-      isFreeMode
+      isFreeMode,
+      goalReached: false
     })
 
     if (this._timer) {
@@ -104,17 +106,14 @@ Page({
         })
         this._remind(tick)
       },
-      onComplete: () => {
-        const elapsed = this._timer.elapsed
+      onGoalReached: () => {
+        // Target hit - don't end. Voice prompt only (no vibration, per
+        // design); keep counting so the user can train to failure.
         const s = storage.getSettings()
-        if (s.vibrate) {
-          try { wx.vibrateLong() } catch (e) {}
-        }
         if (s.voiceGuide !== false) {
-          voice.play('complete')
+          voice.play('goal')
         }
-        // Auto-save + show big completion modal
-        this._saveAndShowCompletion(elapsed)
+        this.setData({ goalReached: true })
       }
     })
   },
@@ -124,7 +123,7 @@ Page({
    * - halfway: once when elapsed reaches half of duration
    * - 30s: once when remaining hits 30
    * - 10s: once when remaining hits 10
-   * - complete: fired in onComplete above
+   * - complete: fired in finishTraining when the user ends the session
    *
    * Vibration and voice are independently gated by `vibrate` / `voiceGuide`
    * settings — user can mute haptics but keep voice (e.g. in office) or vice versa.
@@ -196,8 +195,8 @@ Page({
   },
 
   /**
-   * Detect which celebration level to show. Called at onComplete (BEFORE
-   * saveRecord fires in finishTraining), so stats reflect pre-save state.
+   * Detect which celebration level to show. Called from _saveAndShowCompletion
+   * (runs in finishTraining, BEFORE saveRecord), so stats reflect pre-save state.
    *  - first:     user's very first training ever
    *  - milestone: streak will hit a memorable number after this save
    *  - record:    this duration beats the user's previous max
@@ -312,18 +311,24 @@ Page({
       setTimeout(() => { wx.navigateBack() }, 1500)
       return
     }
+    // Completion voice (replaces the old auto-onComplete cue). No vibration.
+    const s = storage.getSettings()
+    if (s.voiceGuide !== false) {
+      voice.play('complete')
+    }
     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.
+   * Called from finishTraining (the user manually ends; the timer keeps
+   * running past the goal until they stop). Detection of "first / record
+   * / milestone" uses pre-save stats so the level is decided before the
+   * data changes.
    */
   _saveAndShowCompletion(elapsed) {
-    // Unified re-entry guard: covers both the natural-complete (onComplete)
-    // and manual-stop (finishTraining) paths so the save never runs twice.
+    // Re-entry guard: protects the finishTraining path so the save never
+    // runs twice even if the user double-taps end.
     if (this._saving) return
     this._saving = true
 
@@ -421,6 +426,7 @@ Page({
       isPaused: false,
       remaining: this.data.duration,
       overtime: 0,
+      goalReached: false,
       // Re-init countUp so the big number rolls again on next start
       _countUpTask: null
     })