feat: Add case review messaging system with feedback and query capabilities

- Introduced CaseReviewMessage model to handle feedback and queries for cases.
- Implemented views for displaying user and CID messages, including outstanding feedback.
- Created templates for collection feedback overview and user messages.
- Added functionality for acknowledging messages and sending feedback or queries.
- Enhanced collection detail view to show outstanding messages and user message statistics.
- Added tests for handling duplicate DICOM uploads without series.

atlas/tests/test_api.py

@@ -0,0 +1,34 @@
+from types import SimpleNamespace
+from django.core.files.uploadedfile import SimpleUploadedFile
+
+import atlas.api as atlas_api
+from atlas.models import DuplicateDicom, SeriesImage
+
+
+def test_upload_dicom_duplicate_series_image_without_series_does_not_500(
+    monkeypatch,
+):
+    request = SimpleNamespace(user=SimpleNamespace(is_authenticated=True))
+
+    class DummyUncategorisedDicom:
+        def __init__(self, image, user):
+            self.image = image
+            self.user = user
+            self.image_blake3_hash = "hash123"
+
+        def save(self, *args, **kwargs):
+            raise DuplicateDicom(SeriesImage(series=None))
+
+    monkeypatch.setattr(atlas_api, "UncategorisedDicom", DummyUncategorisedDicom)
+
+    upload = SimpleUploadedFile(
+        "duplicate-no-series.dcm",
+        b"dicom-bytes",
+        content_type="application/dicom",
+    )
+    payload = atlas_api.upload_dicom(request, files=[upload])
+
+    assert payload["uploaded"] == []
+    assert payload["failed"] == []
+    assert payload["duplicate_series"] == []
+    assert payload["duplicates"] == [("duplicate-no-series.dcm", "hash123")]