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/widget/refreshable_state.dart

@@ -56,7 +56,6 @@ mixin BaseWidgetProperties {
       centerTitle: false,
       bottom: tabs.isEmpty ? null : TabBar(tabs: tabs),
       title: Text(getAppBarTitle()),
-      backgroundColor: COLOR_APP_BAR,
       actions: appBarActions(context),
       leading: backButton(context, key),
     );