chore：语音输入正常

pages_tool/ai-chat/ai-chat-message.vue

@@ -4077,6 +4077,7 @@ _handleStreamError(msg) {
       if (this._voiceRecorder) return
       this.voiceHolding = true
       this.voiceHoldCancelling = false
+      this._voiceHoldStartTime = Date.now()
       try {
         const touch = (e && e.touches && e.touches[0]) || null
         this._voiceHoldStartY = touch ? touch.clientY : 0
@@ -4143,12 +4144,20 @@ _handleStreamError(msg) {
       }
       try {
         const result = await this._voiceRecorder.stop()
-        console.log('[ai-chat] voice hold stop result:', JSON.stringify(result))
+        const pressDuration = this._voiceHoldStartTime ? Date.now() - this._voiceHoldStartTime : 0
+        console.log('[ai-chat] voice hold stop result:', JSON.stringify(result), 'pressDuration=', pressDuration)
         this._teardownVoiceRecorder()
         if (!result || !result.filePath) {
           uni.showToast({ title: this.$lang('ai-chat.index.voiceStopFailed'), icon: 'none' })
           return
         }
+        // PR-FRONTEND-VOICE-MIN-DURATION (2026-09-29): 过滤过短录音, 像微信一样提示"说话时间太短",
+        //   避免发出去 100ms 的空语音导致播放失败/后端无法识别。
+        if (result.duration < 500) {
+          console.log('[ai-chat] voice too short, discarded:', result.duration, 'ms')
+          uni.showToast({ title: this.$lang('ai-chat.index.voiceTooShort'), icon: 'none' })
+          return
+        }
         await this._handleRecordedAudio(result)
         // PR-FRONTEND-VOICE-AUTO-SEND (2026-09-29): 按住说话像微信一样, 松手后自动发送,
         //   不需要用户再点一次发送按钮。
@@ -4301,6 +4310,11 @@ _handleStreamError(msg) {
     //   voice-recorder.js 自身不带 Vue 上下文, 通过 err.code 映射到 $lang() key
     _voiceErrMsg(err) {
       if (!err) return ''
+      const msg = (err && (err.errMsg || err.message || err.errMsg)) || ''
+      // 微信录音单例仍被占用 (通常因上一次 onStop 尚未触发就被下一次 start 抢占)
+      if (msg && (msg.includes("is recording") || msg.includes("operateRecorder:fail:audio"))) {
+        return this.$lang('ai-chat.index.voiceRecorderBusy')
+      }
       switch (err.code) {
         case 'NOT_SUPPORTED':
         case 'NO_RECORDER_MANAGER':
@@ -4311,9 +4325,9 @@ _handleStreamError(msg) {
           return this.$lang('ai-chat.index.voiceStartFailed')
         case 'UNI_RECORD_ERROR':
           // 诊断期: 直接透出微信原始错误 (errMsg/message), 便于截图定位根因
-          return (err && (err.errMsg || err.message)) || this.$lang('ai-chat.index.voiceStopFailed')
+          return msg || this.$lang('ai-chat.index.voiceStopFailed')
         default:
-          return err.message || ''
+          return msg || ''
       }
     },