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/main.dart

@@ -16,6 +16,7 @@ import "package:inventree/inventree/sentry.dart";
 import "package:inventree/l10n/supported_locales.dart";
 import "package:inventree/l10n/collected/app_localizations.dart";
 import "package:inventree/settings/release.dart";
+import "package:inventree/user_profile.dart";
 import "package:inventree/widget/home.dart";
 
 Future<void> main() async {
@@ -123,6 +124,9 @@ class InvenTreeAppState extends State<StatefulWidget> {
     Locale? locale = await InvenTreeSettingsManager().getSelectedLocale();
     setLocale(locale);
 
+    // First-run only: seed a demo server profile if none are configured
+    await UserProfileDBManager().seedDemoProfileIfNeeded();
+
     // Display release notes if this is a new version
     final String version =
         await InvenTreeSettingsManager().getValue("recentVersion", "")