ARIA: remove aria-sort from sort button; Password column tests

- Sort button: aria-sort removed (button role does not support it).
- Index tests: remove aria-sort assertions; add Password column display tests.

lib/mv_web/components/table_components.ex

@@ -20,7 +20,6 @@ defmodule MvWeb.TableComponents do
       type="button"
       phx-click="sort"
       phx-value-field={@field}
-      aria-sort={aria_sort(@sort_field, @sort_order, @field)}
       class="flex items-center gap-1 hover:underline focus:outline-none"
     >
       <span>{@label}</span>
@@ -33,12 +32,4 @@ defmodule MvWeb.TableComponents do
     </button>
     """
   end
-
-  defp aria_sort(current_field, current_order, this_field) do
-    cond do
-      current_field != this_field -> "none"
-      current_order == :asc -> "ascending"
-      true -> "descending"
-    end
-  end
 end