UI updates (#849)

* Updated dashboard

- Display "outstanding" badges
- Display "overdue" badges
- Pull-to-refresh

* Remove dead code

* Refactor app colors

* Add "pending shipments" icon

* Remove custom spinner

* Refactor error dialog

* Updated redirect after login

* Refactor login/account pages

- Better UX and confirmation messages

* Refactor API error messages

* Improve token management

- Secure storage
- Handle session expiry
- Per-profile HTTPS certificate checks

* Improved error messages

lib/settings/barcode_settings.dart

@@ -1,9 +1,9 @@
 import "package:flutter/material.dart";
 import "package:flutter_tabler_icons/flutter_tabler_icons.dart";
 
+import "package:inventree/app_colors.dart";
 import "package:inventree/l10.dart";
 import "package:inventree/preferences.dart";
-import "package:inventree/app_colors.dart";
 
 import "package:inventree/widget/dialogs.dart";
 
@@ -68,7 +68,7 @@ class _InvenTreeBarcodeSettingsState
           ),
           actions: <Widget>[
             MaterialButton(
-              color: Colors.red,
+              color: COLOR_DANGER,
               textColor: Colors.white,
               child: Text(L10().cancel),
               onPressed: () {
@@ -78,7 +78,7 @@ class _InvenTreeBarcodeSettingsState
               },
             ),
             MaterialButton(
-              color: Colors.green,
+              color: COLOR_SUCCESS,
               textColor: Colors.white,
               child: Text(L10().ok),
               onPressed: () async {
@@ -120,10 +120,7 @@ class _InvenTreeBarcodeSettingsState
     }
 
     return Scaffold(
-      appBar: AppBar(
-        title: Text(L10().barcodeSettings),
-        backgroundColor: COLOR_APP_BAR,
-      ),
+      appBar: AppBar(title: Text(L10().barcodeSettings)),
       body: Container(
         child: ListView(
           children: [