fix: audit fixes — dedupe run_state logs, stop device on scan exit

- Only log run_state when value changes (avoid flooding console)
- Send stopTreatment on unload if scan is in progress (stop device LEDs)

miniprogram/pages/auto-scan/auto-scan.js

@@ -72,9 +72,13 @@ Page({
     }
     ble.on('adc', self._onAdc)
 
+    self._lastRunState = -1
     self._onRunState = function (data) {
       if (self._completed) return
+      if (data.run_state !== self._lastRunState) {
         console.log('[SCAN] run_state:', data.run_state)
+        self._lastRunState = data.run_state
+      }
       if (data.run_state === 0x01) {
         self._seenScanning = true
       }
@@ -158,6 +162,9 @@ Page({
   },
 
   onUnload: function () {
+    if (this.data.state === 'scanning' && !this._completed) {
+      ble.stopTreatment().catch(function () {})
+    }
     this._cleanup()
   }
 })