Add downsample series functionality and related UI updates

- Implemented asynchronous downsample task for series with progress tracking.
- Added new URL endpoint for downsample status.
- Updated Series model to include source_series_instance_uid.
- Enhanced case display template with new buttons for series actions.
- Added password reset functionality in user profile with appropriate alerts.
- Created migration for new source_series_instance_uid field in Series model.

rad/tests/test_user_access.py

@@ -1,5 +1,6 @@
 
 from django.urls import reverse
+from django.core import mail
 
 from rich.pretty import pprint
 
@@ -89,3 +90,53 @@ def test_profile_access_and_management(db, client, create_users, create_cid_mana
     assert BeautifulSoup(update_profile_response.content, "html.parser").find(id="id_registration_number")["value"]
 
 
+@pytest.mark.django_db
+def test_create_user_reuses_existing_account(client, create_cid_manager, django_user_model):
+    existing_user = django_user_model.objects.create_user(
+        username="existing@example.com",
+        email="existing@example.com",
+        password="password123",
+        first_name="Old",
+        last_name="Name",
+    )
+
+    client.force_login(create_cid_manager)
+
+    response = client.post(
+        reverse("create_user"),
+        {
+            "username": "existing@example.com",
+            "first_name": "Updated",
+            "last_name": "User",
+            "grade": "",
+        },
+    )
+
+    assert response.status_code == 302
+    assert response.url == reverse("accounts_list")
+
+    existing_user.refresh_from_db()
+    assert existing_user.first_name == "Updated"
+    assert existing_user.last_name == "User"
+
+
+@pytest.mark.django_db
+def test_cid_manager_can_send_password_reset_from_account_profile(client, create_cid_manager, django_user_model):
+    managed_user = django_user_model.objects.create_user(
+        username="managed-user",
+        email="managed@example.com",
+        password="password123",
+    )
+
+    client.force_login(create_cid_manager)
+    response = client.post(
+        reverse("account_send_password_reset", kwargs={"slug": managed_user.username}),
+        {"next": reverse("account_profile", kwargs={"slug": managed_user.username})},
+    )
+
+    assert response.status_code == 302
+    assert "password_reset_action=sent" in response.url
+    assert len(mail.outbox) == 1
+    assert mail.outbox[0].to == ["managed@example.com"]
+
+