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/settings.dart

@@ -42,10 +42,7 @@ class _InvenTreeSettingsState extends State<InvenTreeSettingsWidget> {
   Widget build(BuildContext context) {
     return Scaffold(
       key: _scaffoldKey,
-      appBar: AppBar(
-        title: Text(L10().settings),
-        backgroundColor: COLOR_APP_BAR,
-      ),
+      appBar: AppBar(title: Text(L10().settings)),
       body: Center(
         child: ListView(
           children: [