feat(patient): implement doctor-only patient deletion, alert theme styling, and test auto-cleanup

lib/features/patient/presentation/store/patient_store.dart

@@ -23,6 +23,9 @@ abstract class _PatientStoreBase with Store {
   @observable
   bool isSaving = false;
 
+  @observable
+  bool isDeleting = false;
+
   @observable
   String? errorMessage;
 
@@ -185,6 +188,7 @@ abstract class _PatientStoreBase with Store {
     successMessage = null;
     isLoading = false;
     isSaving = false;
+    isDeleting = false;
 
     final now = DateTime.now();
     fecReg = DateFormat('dd/MM/yyyy').format(now);
@@ -391,4 +395,31 @@ abstract class _PatientStoreBase with Store {
       return false;
     }
   }
+
+  @action
+  Future<bool> deletePatient() async {
+    if (id == null) {
+      errorMessage = 'No se puede eliminar un paciente que no ha sido guardado.';
+      return false;
+    }
+
+    isDeleting = true;
+    errorMessage = null;
+    successMessage = null;
+
+    try {
+      await service.deletePatient(id!);
+      runInAction(() {
+        isDeleting = false;
+        successMessage = 'Paciente eliminado exitosamente';
+      });
+      return true;
+    } catch (e) {
+      runInAction(() {
+        errorMessage = e.toString().replaceAll('Exception: ', '');
+        isDeleting = false;
+      });
+      return false;
+    }
+  }
 }