perf: resolve permitted_document_ids once before email/share loops

Replaces per-document has_perms_owner_aware calls in the email-document
action and bulk share-link-bundle creation with a single
permitted_document_ids(request.user) resolution before the loop,
reducing DB round-trips while preserving identical permission
semantics (including the per-document error message on the bundle
endpoint).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GRp4kf1mdn9ruv81zWAmh2

src/documents/tests/test_permission_filtering_security.py

@@ -256,3 +256,27 @@ class TestPermittedDocumentIdsArbitraryPermission:
             expected_visible=[],
             expected_hidden=[doc.pk],
         )
+
+
+@pytest.mark.django_db
+class TestEmailDocumentPermissionBoundary:
+    def test_email_action_rejects_document_without_view_permission(
+        self,
+        rest_api_client,
+    ):
+        owner = User.objects.create_user(username="owner")
+        requester = User.objects.create_user(username="requester")
+        rest_api_client.force_authenticate(user=requester)
+        hidden = DocumentFactory(owner=owner)
+
+        response = rest_api_client.post(
+            "/api/documents/email/",
+            {
+                "documents": [hidden.pk],
+                "addresses": "someone@example.com",
+                "subject": "test",
+                "message": "test",
+            },
+            format="json",
+        )
+        assert response.status_code == 403

src/documents/tests/test_share_link_bundles.py

@@ -60,7 +60,7 @@ class ShareLinkBundleAPITests(DirectoriesMixin, APITestCase):
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
         self.assertIn("document_ids", response.data)
 
-    @mock.patch("documents.views.has_perms_owner_aware", return_value=False)
+    @mock.patch("documents.views.permitted_document_ids", return_value=set())
     def test_create_bundle_rejects_insufficient_permissions(self, perms_mock) -> None:
         payload = {
             "document_ids": [self.document.pk],

src/documents/views.py

@@ -1925,12 +1925,9 @@ class DocumentViewSet(
         use_archive_version = validated_data.get("use_archive_version", True)
 
         documents = Document.objects.select_related("owner").filter(pk__in=document_ids)
-        for document in documents:
-            if request.user is not None and not has_perms_owner_aware(
-                request.user,
-                "view_document",
-                document,
-            ):
+        if request.user is not None:
+            permitted_ids = set(permitted_document_ids(request.user))
+            if not all(document.pk in permitted_ids for document in documents):
                 return HttpResponseForbidden("Insufficient permissions")
 
         try:
@@ -4505,8 +4502,9 @@ class ShareLinkBundleViewSet(PassUserMixin, ModelViewSet[ShareLinkBundle]):
             )
 
         documents = list(documents_qs)
+        permitted_ids = set(permitted_document_ids(request.user))
         for document in documents:
-            if not has_perms_owner_aware(request.user, "view_document", document):
+            if document.pk not in permitted_ids:
                 raise ValidationError(
                     {
                         "document_ids": _(