fix(device): 修复设备连接与配网多场景问题，同名设备用 deviceId 区分

- 连接中关闭蓝牙立即结束 loading，不再卡到超时
- onShow 已连接时同步标记，重新搜索不误标已连接设备
- 连接中防重入，搜索中切后台重置状态
- 配网成功立即退出配网模式，密码必填且 8-16 位
- 配网失败重试定时器可清理
- 同名设备改用 deviceId 唯一标识并展示

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

miniprogram/pages/connectedDevice/connectedDevice.ts

@@ -4,6 +4,7 @@ import type { RawDevice } from '../../lefu/types'
 
 /** 渲染用的设备项（RawDevice 含复杂对象，不进 setData） */
 interface DeviceItem {
+    deviceId: string
     name: string
     connected: boolean
 }
@@ -34,13 +35,19 @@ Page({
 
     onShow() {
         // 从其他页面返回时同步连接状态
-        if (!leFuService.isConnected) {
+        if (leFuService.isConnected) {
+            this._markConnected()
+        } else {
             this._markAllDisconnected()
         }
     },
 
     onHide() {
         leFuService.stopScan()
+        // 搜索中切后台：停止扫描后重置状态，避免回来显示「搜索中」假状态
+        if (this.data.status === 'searching') {
+            this.setData({ status: 'idle' })
+        }
     },
 
     onUnload() {
@@ -91,16 +98,19 @@ Page({
         })
     },
 
+    /** 获取当前已连接设备的 deviceId（未连接返回空字符串） */
+    _getConnectedId(): string {
+        if (!leFuService.isConnected) return ''
+        const cached = wx.getStorageSync('connectDeviceInfo') as Record<string, any> | null
+        return cached?.deviceId || ''
+    },
+
     /** 连接成功后把对应设备卡片标记为已连接（覆盖手动连接与自动重连） */
     _markConnected() {
-        const cached = wx.getStorageSync('connectDeviceInfo') as Record<string, any> | null
-        const name = leFuService.deviceInfo?.modelNumber
-            || cached?.scaleDeviceName
-            || cached?.name
-            || cached?.deviceName
-        if (!name) return
+        const id = this._getConnectedId()
+        if (!id) return
         this.setData({
-            deviceList: this.data.deviceList.map(item => ({ ...item, connected: item.name === name })),
+            deviceList: this.data.deviceList.map(item => ({ ...item, connected: item.deviceId === id })),
         })
     },
 
@@ -174,10 +184,14 @@ Page({
                 this.setData({ status: 'empty', deviceList: [] })
                 return
             }
-            const connectedName = this.data.deviceList.find(d => d.connected)?.name
+            const connectedId = this._getConnectedId()
             this.setData({
                 status: 'found',
-                deviceList: devices.map(d => ({ name: d.name, connected: d.name === connectedName })),
+                deviceList: devices.map(d => ({
+                    deviceId: d.raw.deviceId || '',
+                    name: d.name,
+                    connected: !!connectedId && d.raw.deviceId === connectedId,
+                })),
             })
             this._tryAutoConnect()
         })
@@ -193,6 +207,8 @@ Page({
     /** 命中缓存设备时自动连接一次 */
     _tryAutoConnect() {
         if (autoConnectTried) return
+        // 已连接时不自动重连，避免触发断开重连
+        if (leFuService.isConnected) return
         const cached = wx.getStorageSync('connectDeviceInfo') as RawDevice | null
         if (!cached?.deviceId) return
         const index = scannedDevices.findIndex(d => d.raw.deviceId === cached.deviceId)
@@ -205,6 +221,8 @@ Page({
     _connectByIndex(index: number, isAuto: boolean) {
         const scanned = scannedDevices[index]
         if (!scanned) return
+        // 连接中：防止重复点击导致连接流程被重复触发
+        if (connectCleanup) return
 
         wx.showLoading({ title: '连接中...', mask: true })
         leFuService.stopScan()
@@ -230,6 +248,10 @@ Page({
             if (state === leFuService.BLUE_STATE.CONNECTFAILED) {
                 finish()
                 wx.showToast({ title: '连接失败，请重试', icon: 'none' })
+            } else if (state === leFuService.BLUE_STATE.UNAVAILABLE) {
+                // 连接过程中蓝牙被关闭：立即结束 loading，避免卡到超时
+                finish()
+                wx.showToast({ title: '蓝牙已断开，请重新开启', icon: 'none' })
             }
         })