Fix report download buttons showing as disabled (#2840)

* Fix for lazy loading while checking if file exists

* Fixed linting errors

* Fixed for static scan

tests/app/main/views/test_download_availability.py

@@ -0,0 +1,41 @@
+from unittest.mock import Mock, patch
+
+from app.main.views.activity import get_report_info
+
+
+def test_report_metadata_loading_fix(mocker):
+    """Test that metadata is loaded correctly after check_s3_file_exists"""
+    mock_s3_obj = Mock()
+    # After check_s3_file_exists calls load(), content_length is populated
+    mock_s3_obj.content_length = 86528
+
+    with patch("app.s3_client.get_s3_object", return_value=mock_s3_obj):
+        with patch("app.s3_client.check_s3_file_exists", return_value=True):
+            s3_config = {
+                "bucket": "test-bucket",
+                "access_key_id": "test-key",
+                "secret_access_key": "test-secret",  # pragma: allowlist secret
+                "region": "us-east-1",
+            }
+
+            result = get_report_info("service-123", "1-day-report", s3_config)
+
+            assert result == {"available": True, "size": "84.5 KB"}
+
+
+def test_report_not_found(mocker):
+    """Test when report doesn't exist"""
+    mock_s3_obj = Mock()
+
+    with patch("app.s3_client.get_s3_object", return_value=mock_s3_obj):
+        with patch("app.s3_client.check_s3_file_exists", return_value=False):
+            s3_config = {
+                "bucket": "test-bucket",
+                "access_key_id": "test-key",
+                "secret_access_key": "test-secret",  # pragma: allowlist secret
+                "region": "us-east-1",
+            }
+
+            result = get_report_info("service-123", "1-day-report", s3_config)
+
+            assert result == {"available": False, "size": None}