refactor(member): share Ash error formatting across member-show components

lib/mv_web/helpers/ash_error_helpers.ex

@@ -0,0 +1,34 @@
+defmodule MvWeb.Helpers.AshErrorHelpers do
+  @moduledoc """
+  Shared formatting for Ash errors surfaced as flash messages in the
+  member show LiveComponents.
+
+  Centralizes the translation of `Ash.Error.Invalid` / `Ash.Error.Forbidden`
+  (and plain string/unknown errors) into user-facing text so the components do
+  not each carry their own copy.
+  """
+  use Gettext, backend: MvWeb.Gettext
+
+  @doc """
+  Turns an Ash error into a human-readable, localized string.
+
+  - `Ash.Error.Invalid` — joins the individual error messages, falling back to
+    `inspect/1` for sub-errors that carry no `:message`.
+  - `Ash.Error.Forbidden` — a localized "not allowed" message.
+  - a binary — passed through unchanged (already a ready-to-show message).
+  - anything else — a localized generic error message.
+  """
+  def format_error(%Ash.Error.Invalid{errors: errors}) do
+    Enum.map_join(errors, ", ", fn
+      %{message: message} -> message
+      other -> inspect(other)
+    end)
+  end
+
+  def format_error(%Ash.Error.Forbidden{}) do
+    gettext("You are not allowed to perform this action.")
+  end
+
+  def format_error(error) when is_binary(error), do: error
+  def format_error(_error), do: gettext("An error occurred")
+end