♻️(backend) do not paginate threads list response

The threads list action was paginated its response. this is not the
behavior we want. all threads should be loaded when the document is
loaded.

CHANGELOG.md

@@ -11,12 +11,13 @@ and this project adheres to
 - 🚸(frontend) allow opening "@page" links with ctrl/command/middle-mouse click
 - ✅ E2E - Any instance friendly #2142
 
+### Changed
+
+- ♻️(backend) do not paginate threads list response #2186
+
 ### Fixed
 
 - 🐛(frontend) Fix drop cursor creating columns #2185
-
-### Fixed
-
 - 🐛 Fixed side effects between comments and versioning #2183
 
 ## [v4.8.5] - 2026-04-03

src/backend/core/api/viewsets.py

@@ -2757,7 +2757,7 @@ class ThreadViewSet(
     """Thread API: list/create threads and nested comment operations."""
 
     permission_classes = [permissions.CommentPermission]
-    pagination_class = Pagination
+    pagination_class = None
     serializer_class = serializers.ThreadSerializer
     queryset = models.Thread.objects.select_related("creator", "document").filter(
         resolved=False

src/backend/core/tests/documents/test_api_documents_threads.py

@@ -342,7 +342,7 @@ def test_api_documents_threads_list_public_document_link_role_higher_than_reader
         f"/api/v1.0/documents/{document.id!s}/threads/",
     )
     assert response.status_code == 200
-    assert response.json()["count"] == 3
+    assert len(response.json()) == 3
 
 
 def test_api_documents_threads_list_authenticated_document_anonymous_user():
@@ -406,7 +406,7 @@ def test_api_documents_threads_list_authenticated_document(link_role):
         f"/api/v1.0/documents/{document.id!s}/threads/",
     )
     assert response.status_code == 200
-    assert response.json()["count"] == 3
+    assert len(response.json()) == 3
 
 
 def test_api_documents_threads_list_restricted_document_anonymous_user():
@@ -473,7 +473,7 @@ def test_api_documents_threads_list_restricted_document_editor(role):
         f"/api/v1.0/documents/{document.id!s}/threads/",
     )
     assert response.status_code == 200
-    assert response.json()["count"] == 3
+    assert len(response.json()) == 3
 
 
 # Retrieve