fix: index page — no loading flash on tab switch, subscription always tappable

- Loading animation only shows on first visit, subsequent onShow updates silently
- Subscription row always navigates to plans page (was no-op when active)
- Move devMode init to onLoad (only needs to run once)

miniprogram/pages/index/index.js

@@ -18,8 +18,11 @@ Page({
     loading: true
   },
 
-  onShow: function () {
+  onLoad: function () {
     this.setData({ devMode: config.__DEV__ || false })
+  },
+
+  onShow: function () {
     this.checkState()
     this._onStatus = this.onBleStatus.bind(this)
     ble.on('status', this._onStatus)
@@ -48,7 +51,8 @@ Page({
       return
     }
 
-    self.setData({ connected: ble.isConnected(), loading: true })
+    var isFirstLoad = self.data.loading
+    self.setData({ connected: ble.isConnected() })
 
     var p1 = api.getDevices().then(function (data) {
       var devices = data.devices || []
@@ -74,7 +78,7 @@ Page({
     })
 
     Promise.all([p1, p2]).then(function () {
-      self.setData({ loading: false })
+      if (isFirstLoad) self.setData({ loading: false })
     })
   },
 
@@ -180,8 +184,6 @@ Page({
   },
 
   onViewSubscription: function () {
-    if (!this.data.subscription || this.data.subscription.status !== 'active') {
     wx.navigateTo({ url: '/pages/subscribe-plans/subscribe-plans' })
   }
-  }
 })