V6 Post migration cleanup

tests/ui/test_documents_page.py

@@ -17,6 +17,7 @@ from transcription.db.models import Person
 from transcription.db.models import PersonRole
 from transcription.db.models import Source
 from transcription.db.models import Tag
+from transcription.ui.pages.documents_page import _first_source_path
 from transcription.ui.pages.documents_page import _resolve_selected_tag_labels
 
 # --- Helper Fixtures ---
@@ -107,6 +108,40 @@ class TestDocumentsPageRendering:
             re.DOTALL,
         )
 
+    def test_first_source_path_prefers_lowest_page_number(self):
+        document = Document(name="Ordering Test")
+        document.sources = [
+            Source(
+                document_id=document.id,
+                page_number=3,
+                upload_name="c.jpg",
+                filename="c.jpg",
+                file_path="documents/c.jpg",
+                file_hash="c" * 64,
+                file_size_bytes=1,
+            ),
+            Source(
+                document_id=document.id,
+                page_number=1,
+                upload_name="a.jpg",
+                filename="a.jpg",
+                file_path="documents/a.jpg",
+                file_hash="a" * 64,
+                file_size_bytes=1,
+            ),
+            Source(
+                document_id=document.id,
+                page_number=2,
+                upload_name="b.jpg",
+                filename="b.jpg",
+                file_path="documents/b.jpg",
+                file_hash="b" * 64,
+                file_size_bytes=1,
+            ),
+        ]
+
+        assert _first_source_path(document) == "documents/a.jpg"
+
     def test_document_create_page_renders_form(self, app_client):
         _, client = app_client