feat: bell-tower favicon, lfx-clean flows, branded HTML mail

backend/scripts/make_flow_fixtures.py

@@ -143,6 +143,19 @@ def kirche_node(
     node_dict = _normalize(node_dict, node_id, comp_name, *position)
     for field, value in (values or {}).items():
         node_dict["data"]["node"]["template"][field]["value"] = value
+    # lfx validate --level 4 errors on required inputs with no value and no
+    # incoming edge. Our form fields are filled at runtime via the
+    # form_values envelope (collect() merges), never via edges — so required
+    # template fields carry a single-space sentinel value. The form parser
+    # (app/flows/input_schema.py) treats whitespace-only values as "no
+    # default", keeping the web form clean.
+    for field_def in node_dict["data"]["node"]["template"].values():
+        if (
+            isinstance(field_def, dict)
+            and field_def.get("required")
+            and field_def.get("value") in (None, "", [], {})
+        ):
+            field_def["value"] = " "
     return node_dict