Android style fixes (#286)

* Delete redundant loading div

* Match SafeArea background color with system

* Format and lint

mobile/App.tsx

@@ -1,18 +1,24 @@
 import React, { useEffect, useRef } from 'react';
 import { WebView, WebViewMessageEvent } from 'react-native-webview';
-import { SafeAreaView, Text, Platform } from 'react-native';
+import { SafeAreaView, Text, Platform, Appearance } from 'react-native';
 import TorClient from './services/Tor';
 import Clipboard from '@react-native-clipboard/clipboard';
 import NetInfo from '@react-native-community/netinfo';
 import EncryptedStorage from 'react-native-encrypted-storage';
 
+const backgroundColors = {
+  light: 'white',
+  dark: 'black',
+};
+
 const App = () => {
+  const colorScheme = Appearance.getColorScheme();
   const torClient = new TorClient();
   const webViewRef = useRef<WebView>();
   const uri = (Platform.OS === 'android' ? 'file:///android_asset/' : '') + 'Web.bundle/index.html';
 
   const injectMessageResolve = (id: string, data?: object) => {
-    const json = JSON.stringify(data || {});
+    const json = JSON.stringify((data != null) || {});
     webViewRef.current?.injectJavaScript(
       `(function() {window.NativeRobosats.onMessageResolve(${id}, ${json});})();`,
     );
@@ -26,8 +32,8 @@ const App = () => {
   };
 
   const init = (reponseId: string) => {
-    const loadCookie = (key: string) => {
-      return EncryptedStorage.getItem(key).then((value) => {
+    const loadCookie = async (key: string) => {
+      return await EncryptedStorage.getItem(key).then((value) => {
         if (value) {
           const json = JSON.stringify({ key, value });
           webViewRef.current?.injectJavaScript(
@@ -132,7 +138,7 @@ const App = () => {
   };
 
   return (
-    <SafeAreaView style={{ flex: 1 }}>
+    <SafeAreaView style={{ flex: 1, backgroundColor: backgroundColors[colorScheme] }}>
       <WebView
         source={{
           uri,
@@ -154,10 +160,10 @@ const App = () => {
         setBuiltInZoomControls={false}
         allowingReadAccessToURL={uri}
         allowFileAccess={true}
-        allowsBackForwardNavigationGestures={false}
+        allowsBackForwardNavigationGestures={true}
         mediaPlaybackRequiresUserAction={false}
         allowsLinkPreview={false}
-        renderLoading={() => <Text>Loading RoboSats</Text>}
+        renderLoading={() => <Text></Text>}
         onError={(syntheticEvent) => <Text>{syntheticEvent.type}</Text>}
       />
     </SafeAreaView>

mobile/services/Tor/index.ts

@@ -12,7 +12,7 @@ class TorClient {
     });
   }
 
-  private connectDaemon: () => void = async () => {
+  private readonly connectDaemon: () => void = async () => {
     try {
       this.daemon.startIfNotStarted();
     } catch {