fix(connectedDevice): 连接后等 SN 到位再绑定，拿不到 SN 时断开重置

- 连接成功后同时监听 deviceConnect 与 deviceInfo，两个信号都到位才调绑定接口，避免空 SN 绑定
- 15 秒超时仍拿不到 SN 时断开连接、清缓存、重置页面状态

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

miniprogram/pages/connectedDevice/connectedDevice.ts

@@ -34,6 +34,7 @@ let connectCleanup: {
     timer: number | null
     unsubState: (() => void) | null
     unsubConnect: (() => void) | null
+    unsubInfo: (() => void) | null
 } | null = null
 /** 一次性防重入标记 */
 let modalLocked = false
@@ -169,6 +170,7 @@ Page({
         if (connectCleanup.timer !== null) clearTimeout(connectCleanup.timer)
         connectCleanup.unsubState?.()
         connectCleanup.unsubConnect?.()
+        connectCleanup.unsubInfo?.()
         connectCleanup = null
     },
 
@@ -305,19 +307,42 @@ Page({
         leFuService.connect(scanned.raw)
 
         this._clearConnectCleanup()
-        connectCleanup = { timer: null, unsubState: null, unsubConnect: null }
+        connectCleanup = { timer: null, unsubState: null, unsubConnect: null, unsubInfo: null }
 
         const finish = () => {
             if (connectCleanup?.timer !== null) clearTimeout(connectCleanup.timer)
             connectCleanup?.unsubState?.()
             connectCleanup?.unsubConnect?.()
+            connectCleanup?.unsubInfo?.()
             connectCleanup = null
             wx.hideLoading()
         }
 
+        // 连接成功 + SN 到位两个信号都满足才调接口，各自事件独立触发、顺序不定
+        let connected = false
+        let sn: string | undefined
+        const tryBind = () => {
+            if (!connected || !sn) return
+            finish()
+            // 手动/自动连接：绑定设备成功后缓存设备并跳配网
+            this._bindDevice(sn, () => {
+                wx.setStorageSync('connectDeviceInfo', { ...scanned.raw, scaleDeviceName: scanned.raw.name })
+                wx.navigateTo({ url: '/pages/connectedWifi/connectedWifi' })
+            })
+        }
+
         connectCleanup.timer = setTimeout(() => {
             finish()
-            wx.showToast({ title: '连接超时', icon: 'none' })
+            if (connected) {
+                // 已连上但一直没拿到 SN：断开并重置，避免设备残留占用连接
+                leFuService.disconnect()
+                wx.removeStorageSync('connectDeviceInfo')
+                scannedDevices = []
+                this.setData({ status: 'idle', deviceList: [] })
+                wx.showToast({ title: '设备信息异常，请重试', icon: 'none' })
+            } else {
+                wx.showToast({ title: '连接超时', icon: 'none' })
+            }
         }, 15000)
 
         connectCleanup.unsubState = leFuService.onConnectState((state) => {
@@ -331,13 +356,14 @@ Page({
         })
 
         connectCleanup.unsubConnect = leFuService.onDeviceConnect(() => {
-            finish()
-            const sn = leFuService.deviceInfo?.serialNumber
-            // 手动/自动连接：绑定设备成功后缓存设备并跳配网
-            this._bindDevice(sn ?? '', () => {
-                wx.setStorageSync('connectDeviceInfo', { ...scanned.raw, scaleDeviceName: scanned.raw.name })
-                wx.navigateTo({ url: '/pages/connectedWifi/connectedWifi' })
-            })
+            connected = true
+            sn = leFuService.deviceInfo?.serialNumber
+            tryBind()
+        })
+
+        connectCleanup.unsubInfo = leFuService.onDeviceInfo((info) => {
+            sn = info?.serialNumber
+            tryBind()
         })
     },