fix: wear-check page stuck spinning in vendor_33 mode

- vendor_33 mode skips BLE wear detection (protocol doesn't support it)
  and passes check immediately if device is connected
- Show error message if device is not connected
- Retry button navigates back if disconnected instead of re-checking

miniprogram/pages/wear-check/wear-check.js

@@ -38,6 +38,17 @@ Page({
     var self = this
     self.setData({ checking: true, result: null, error: '' })
 
+    if (!ble.isConnected()) {
+      self.setData({ checking: false, result: 'fail', error: '设备未连接，请返回重新连接' })
+      return
+    }
+
+    var protocol = require('../../services/ble/protocol')
+    if (protocol.PROTOCOL_MODE === 'vendor_33') {
+      self.setData({ checking: false, result: 'ok', connected: true })
+      return
+    }
+
     if (this._onStatus) ble.off('status', this._onStatus)
     this._onStatus = function (status) {
       self.setData({ checking: false })
@@ -66,6 +77,10 @@ Page({
   },
 
   onRetry: function () {
+    if (!ble.isConnected()) {
+      wx.navigateBack()
+      return
+    }
     this.checkWearing()
   },