Add manual auth screen

moneymgr_mobile/android/app/src/debug/AndroidManifest.xml

@@ -3,5 +3,8 @@
          the Flutter tool needs it to communicate with the running application
          to allow setting breakpoints, to provide hot reload, etc.
     -->
-    <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <!-- In debug mode, unsecure traffic is permitted -->
+    <application android:usesCleartextTraffic="true" />
 </manifest>

moneymgr_mobile/android/app/src/main/AndroidManifest.xml

@@ -42,4 +42,7 @@
             <data android:mimeType="text/plain"/>
         </intent>
     </queries>
+
+    <!-- Communication with backend -->
+    <uses-permission android:name="android.permission.INTERNET"/>
 </manifest>