feat: treating page monitors fitting/run_state and handles safety events

- Listen for 'fitting' event: detect skin detachment, pause on loss,
  resume on re-attach
- Listen for 'run_state' event: detect device fault (0xFF) and IDLE
  completion (0x00)
- Low battery warnings: toast at <=10%, force stop at <=5%
- Guard finishAsComplete against double-completion
- Proper cleanup of all new event listeners on unload

miniprogram/pages/treating/treating.js

@@ -17,6 +17,8 @@ Page({
     completed: false,
     startedAt: 0,
     regionText: '全区域',
+    fittingLost: false,
+    deviceFault: false
   },
 
   _getRegionText: function (regionMask) {
@@ -44,15 +46,18 @@ Page({
       regionText: this._getRegionText(regions)
     })
 
+    this._sessionId = 'SESS_' + Date.now()
+
     this._onStatus = this.onStatus.bind(this)
+    this._onBattery = this.onBattery.bind(this)
     this._onComplete = this.onComplete.bind(this)
     this._onException = this.onException.bind(this)
     this._onDisconnect = this.onDisconnect.bind(this)
     this._onReconnect = this.onReconnect.bind(this)
     this._onReconnectFailed = this.onReconnectFailed.bind(this)
-    this._sessionId = 'SESS_' + Date.now()
+    this._onFitting = this.onFitting.bind(this)
+    this._onRunState = this.onRunState.bind(this)
 
-    this._onBattery = this.onBattery.bind(this)
     ble.on('status', this._onStatus)
     ble.on('battery', this._onBattery)
     ble.on('treatment_complete', this._onComplete)
@@ -60,6 +65,9 @@ Page({
     ble.on('disconnected', this._onDisconnect)
     ble.on('reconnected', this._onReconnect)
     ble.on('reconnect_failed', this._onReconnectFailed)
+    ble.on('fitting', this._onFitting)
+    ble.on('run_state', this._onRunState)
+
     this.startLocalTimer()
     this.syncCommands()
     this.syncTreatmentStart()
@@ -73,7 +81,42 @@ Page({
     if (this._onDisconnect) ble.off('disconnected', this._onDisconnect)
     if (this._onReconnect) ble.off('reconnected', this._onReconnect)
     if (this._onReconnectFailed) ble.off('reconnect_failed', this._onReconnectFailed)
+    if (this._onFitting) ble.off('fitting', this._onFitting)
+    if (this._onRunState) ble.off('run_state', this._onRunState)
     if (this._localTimer) clearInterval(this._localTimer)
+    if (this._fittingTimer) clearTimeout(this._fittingTimer)
+  },
+
+  onFitting: function (data) {
+    if (this.data.completed) return
+    if (data.fitting === 0 && !this.data.fittingLost) {
+      this.setData({ fittingLost: true, paused: true })
+      wx.showToast({ title: '检测到离肤，请重新佩戴设备', icon: 'none', duration: 3000 })
+    } else if (data.fitting === 1 && this.data.fittingLost) {
+      this.setData({ fittingLost: false, paused: false })
+      wx.showToast({ title: '已重新贴合，继续使用', icon: 'success', duration: 2000 })
+    }
+  },
+
+  onRunState: function (data) {
+    if (this.data.completed) return
+    console.log('[TREAT] run_state:', data.run_state)
+
+    if (data.run_state === 0xFF) {
+      this.setData({ deviceFault: true })
+      var self = this
+      wx.showModal({
+        title: '设备故障',
+        content: '设备上报故障，已自动停止。',
+        showCancel: false,
+        complete: function () { self.finishAsComplete() }
+      })
+      return
+    }
+
+    if (data.run_state === 0x00 && !this.data.paused && !this.data.fittingLost) {
+      this.finishAsComplete()
+    }
   },
 
   startLocalTimer: function () {
@@ -83,6 +126,23 @@ Page({
       var elapsed = Date.now() - self.data.startedAt
       var remaining = Math.max(0, self.data.duration - elapsed)
       self.updateProgress(remaining)
+
+      if (self.data.battery > 0 && self.data.battery <= 5) {
+        clearInterval(timer)
+        wx.showModal({
+          title: '电量过低',
+          content: '设备电量不足5%，已自动停止。请及时充电。',
+          showCancel: false,
+          complete: function () { self.finishAsComplete() }
+        })
+        return
+      }
+
+      if (self.data.battery > 0 && self.data.battery <= 10 && !self._lowBatteryWarned) {
+        self._lowBatteryWarned = true
+        wx.showToast({ title: '电量低，请及时充电', icon: 'none', duration: 3000 })
+      }
+
       if (remaining <= 0) {
         clearInterval(timer)
         self.finishAsComplete()
@@ -179,6 +239,7 @@ Page({
   },
 
   finishAsComplete: function () {
+    if (this.data.completed) return
     var elapsed = Math.min(this.data.duration, Date.now() - this.data.startedAt)
     this.syncTreatmentEnd(elapsed)
     this.onComplete({
@@ -254,6 +315,5 @@ Page({
         }
       }
     })
-  },
-
+  }
 })