fix: add 30s timeout to API calls and catchError fallback on schedule load

Without a timeout, a hanging backend request left the schedule page showing
an infinite spinner forever. Timeout ensures any hung request fails fast and
the spinner resolves. The catchError fallback in schedule_view handles the
edge case where getProfessional rejects unexpectedly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/ui/views/schedule_view.dart

@@ -1,3 +1,4 @@
+import 'package:prosapp_web_app/models/profesional.dart';
 import 'package:prosapp_web_app/models/usuario.dart';
 import 'package:prosapp_web_app/providers/auth_provider.dart';
 import 'package:prosapp_web_app/providers/professional_form_provider.dart';
@@ -39,6 +40,8 @@ class _ScheduleViewState extends State<ScheduleView> {
     professionalFormProvider.clear();
     proProvider.getProfessional(authProvider.user!.id).then((value) {
       professionalFormProvider.setProfesional(value);
+    }).catchError((_) {
+      professionalFormProvider.setProfesional(Profesional.empty());
     });
 
     profileFormProvider.user = authProvider.user;