refactor: reduce nesting depth in RoleLive.Index.mount

Extract role loading logic into separate private functions to fix Credo warning about nested function body.

lib/mv_web/live/role_live/index.ex

@@ -20,35 +20,7 @@ defmodule MvWeb.RoleLive.Index do
 
   @impl true
   def mount(_params, _session, socket) do
-    # Ensure current_user has role loaded for authorization checks
+    socket = ensure_user_role_loaded(socket)
-    socket =
-      if socket.assigns[:current_user] do
-        user = socket.assigns.current_user
-
-        # Load role if not already loaded (check for Ash.NotLoaded struct)
-        user_with_role =
-          case Map.get(user, :role) do
-            %Ash.NotLoaded{} ->
-              case Ash.load(user, :role, domain: Mv.Accounts) do
-                {:ok, loaded_user} -> loaded_user
-                {:error, _} -> user
-              end
-
-            nil ->
-              case Ash.load(user, :role, domain: Mv.Accounts) do
-                {:ok, loaded_user} -> loaded_user
-                {:error, _} -> user
-              end
-
-            role when not is_nil(role) ->
-              user
-          end
-
-        assign(socket, :current_user, user_with_role)
-      else
-        socket
-      end
-
     roles = load_roles()
 
     {:ok,
@@ -57,6 +29,31 @@ defmodule MvWeb.RoleLive.Index do
      |> assign(:roles, roles)}
   end
 
+  defp ensure_user_role_loaded(socket) do
+    if socket.assigns[:current_user] do
+      user = socket.assigns.current_user
+      user_with_role = load_user_role(user)
+      assign(socket, :current_user, user_with_role)
+    else
+      socket
+    end
+  end
+
+  defp load_user_role(user) do
+    case Map.get(user, :role) do
+      %Ash.NotLoaded{} -> load_role_safely(user)
+      nil -> load_role_safely(user)
+      _role -> user
+    end
+  end
+
+  defp load_role_safely(user) do
+    case Ash.load(user, :role, domain: Mv.Accounts) do
+      {:ok, loaded_user} -> loaded_user
+      {:error, _} -> user
+    end
+  end
+
   @impl true
   def handle_event("delete", %{"id" => id}, socket) do
     {:ok, role} = Authorization.get_role(id)