Merge branch 'main' into feat/299_plz

lib/mv/constants.ex

@@ -28,8 +28,26 @@ defmodule Mv.Constants do
 
   @email_validator_checks [:html_input, :pow]
 
+  # Member fields that are required when Vereinfacht integration is active (contact sync)
+  @vereinfacht_required_member_fields [:first_name, :last_name, :street, :postal_code, :city]
+
   def member_fields, do: @member_fields
 
+  @doc """
+  Returns member fields that are always required when Vereinfacht integration is configured.
+
+  Used for validation, member form required indicators, and settings UI (checkbox disabled).
+  """
+  def vereinfacht_required_member_fields, do: @vereinfacht_required_member_fields
+
+  @doc """
+  Returns whether the given member field is required by Vereinfacht when integration is active.
+  """
+  def vereinfacht_required_field?(field) when is_atom(field),
+    do: field in @vereinfacht_required_member_fields
+
+  def vereinfacht_required_field?(_), do: false
+
   @doc """
   Returns the prefix used for custom field keys in field visibility maps.