feat: Add keyboard navigation to member linking dropdown

lib/mv_web/live/user_live/form.ex

@@ -404,7 +404,19 @@ defmodule MvWeb.UserLive.Form do
 
   def handle_event("member_dropdown_keydown", %{"key" => "Enter"}, socket) do
     return_if_dropdown_closed(socket, fn ->
-      select_focused_member(socket)
+      case socket.assigns.focused_member_index do
+        nil ->
+          {:noreply, socket}
+
+        index ->
+          member = Enum.at(socket.assigns.available_members, index)
+
+          if member do
+            handle_event("select_member", %{"id" => member.id}, socket)
+          else
+            {:noreply, socket}
+          end
+      end
     end)
   end
 
@@ -481,18 +493,6 @@ defmodule MvWeb.UserLive.Form do
     end
   end
 
-  # Select the currently focused member from the dropdown
-  @spec select_focused_member(Phoenix.LiveView.Socket.t()) ::
-          {:noreply, Phoenix.LiveView.Socket.t()}
-  defp select_focused_member(socket) do
-    with index when not is_nil(index) <- socket.assigns.focused_member_index,
-         member when not is_nil(member) <- Enum.at(socket.assigns.available_members, index) do
-      handle_event("select_member", %{"id" => member.id}, socket)
-    else
-      _ -> {:noreply, socket}
-    end
-  end
-
   @spec assign_form(Phoenix.LiveView.Socket.t()) :: Phoenix.LiveView.Socket.t()
   defp assign_form(%{assigns: %{user: user, show_password_fields: show_password_fields}} = socket) do
     form =