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/build/build_item_detail.dart

@@ -60,7 +60,7 @@ class _BuildItemDetailWidgetState
     // Unallocate button
     buttons.add(
       SpeedDialChild(
-        child: const Icon(TablerIcons.minus, color: Colors.red),
+        child: Icon(TablerIcons.minus, color: COLOR_DANGER),
         label: L10().unallocate,
         onTap: () async {
           _unallocateStock(context);
@@ -99,7 +99,7 @@ class _BuildItemDetailWidgetState
       L10().unallocateStock,
       L10().unallocateStockConfirm,
       icon: TablerIcons.minus,
-      color: Colors.red,
+      color: COLOR_DANGER,
       acceptText: L10().unallocate,
       onAccept: () async {
         widget.item.delete().then((result) {