fix(circuit): 偶数 set 数休息语音被一半/进度提示吞掉

偶数组数 sets×hold/2 正好压在组练完→休息切换的同一 tick:
_circuitCue 先播 halfway 并占麦 2.6s,导致 _circuitPhase 的
restStart 被静音。修复:atRestBoundary 且 restStart 会播时,
跳过 halfway/last30/last10 让休息语音优先;奇数组数/短组
配置不动,无回归。

pages/timer/timer.js

@@ -354,21 +354,31 @@ Page({
     const s = storage.getSettings()
     const voiceOn = s.voiceGuide !== false
 
+    // Even set counts land a progress threshold (halfway / last30 / last10)
+    // exactly on a work→rest transition. If that prompt speaks it grabs the
+    // mic for ~2.6s (see _playProgressVoice) and mutes the "休息一下" line
+    // fired on the same tick. Yield to rest whenever restStart will actually
+    // play (chatty + rest≥5); short-set configs keep the progress cue as
+    // before. Odd set counts never hit this because the halfway point sits
+    // mid-set, so their progress prompts are unaffected.
+    const atRestBoundary = t.phaseRemaining <= 0 && t.restPerSet > 0 && t.setIndex < t.sets
+    const restWillSpeak = this._circuitCfg.holdPerSet >= 10 && this._circuitCfg.restPerSet >= 5
+
     // Same duration gates as _remind(), so short circuits (e.g. 3 sets × 5s)
     // don't fire "最后30秒" on the very first tick. `<=` rather than `===`
     // survives a skipped second when the app returns from background.
     if (total >= 10 && !this._halfwaySignaled && done >= Math.floor(total / 2)) {
       this._halfwaySignaled = true
-      if (voiceOn) this._playProgressVoice('halfway')
+      if (!(atRestBoundary && restWillSpeak) && voiceOn) this._playProgressVoice('halfway')
       this._vibrateOnce(2, 150)
     }
     if (total > 60 && left <= 30 && !this._last30Signaled) {
       this._last30Signaled = true
-      if (voiceOn) this._playProgressVoice('last30')
+      if (!(atRestBoundary && restWillSpeak) && voiceOn) this._playProgressVoice('last30')
     }
     if (total > 20 && left <= 10 && !this._last10Signaled) {
       this._last10Signaled = true
-      if (voiceOn) this._playProgressVoice('last10')
+      if (!(atRestBoundary && restWillSpeak) && voiceOn) this._playProgressVoice('last10')
     }
 
     // Countdown buzz over the last 5s of the FINAL set (the real finish line).