feat: adds member visibility settings

lib/membership/member.ex

@@ -434,6 +434,70 @@ defmodule Mv.Membership.Member do
     identity :unique_email, [:email]
   end
 
+  @doc """
+  Checks if a member field should be shown in the overview.
+
+  Reads the visibility configuration from Settings resource. If a field is not
+  configured in settings, it defaults to `true` (visible).
+
+  ## Parameters
+    - `field` - Atom representing the member field name (e.g., `:email`, `:street`)
+
+  ## Returns
+    - `true` if the field should be shown in overview (default)
+    - `false` if the field is configured as hidden in settings
+
+  ## Examples
+
+      iex> Member.show_in_overview?(:email)
+      true
+
+      iex> Member.show_in_overview?(:street)
+      true  # or false if configured in settings
+
+  """
+  @spec show_in_overview?(atom()) :: boolean()
+  def show_in_overview?(field) when is_atom(field) do
+    case Mv.Membership.get_settings() do
+      {:ok, settings} ->
+        visibility_config = settings.member_field_visibility || %{}
+        # Normalize map keys to atoms (JSONB may return string keys)
+        normalized_config = normalize_visibility_config(visibility_config)
+
+        # Get value from normalized config, default to true
+        Map.get(normalized_config, field, true)
+
+      {:error, _} ->
+        # If settings can't be loaded, default to visible
+        true
+    end
+  end
+
+  def show_in_overview?(_), do: true
+
+  # Normalizes visibility config map keys from strings to atoms.
+  # JSONB in PostgreSQL converts atom keys to string keys when storing.
+  defp normalize_visibility_config(config) when is_map(config) do
+    Enum.reduce(config, %{}, fn
+      {key, value}, acc when is_atom(key) ->
+        Map.put(acc, key, value)
+
+      {key, value}, acc when is_binary(key) ->
+        try do
+          atom_key = String.to_existing_atom(key)
+          Map.put(acc, atom_key, value)
+        rescue
+          ArgumentError ->
+            acc
+        end
+
+      _, acc ->
+        acc
+    end)
+  end
+
+  defp normalize_visibility_config(_), do: %{}
+
   @doc """
   Performs fuzzy search on members using PostgreSQL trigram similarity.