feat(member): bring the overview table up to WCAG 2.2 AA

test/mv_web/member_live/index_sticky_pinned_test.exs

@@ -1,8 +1,10 @@
 defmodule MvWeb.MemberLive.IndexStickyPinnedTest do
   @moduledoc """
   §1.19 — When the table scrolls vertically and horizontally, the header stays
-  sticky and the identifier (Name) column stays pinned; overflowing cell content
-  truncates with ellipsis and exposes a hover/focus tooltip.
+  sticky. Horizontal pinning is limited to the checkbox column (with a scroll
+  fade marking the boundary) rather than also pinning the Name column;
+  overflowing cell content truncates with ellipsis and exposes a hover/focus
+  tooltip.
   """
   use MvWeb.ConnCase, async: false
 
@@ -30,16 +32,18 @@ defmodule MvWeb.MemberLive.IndexStickyPinnedTest do
     %{conn: conn_with_oidc_user(conn)}
   end
 
-  test "header is sticky and the identifier column is pinned", %{conn: conn} do
+  test "header is sticky and only the checkbox column is pinned", %{conn: conn} do
     {:ok, _view, html} = live(conn, ~p"/members")
 
     # Sticky header (desktop).
     assert html =~ "lg:sticky"
     assert html =~ "lg:top-0"
 
-    # Checkbox column pinned at left-0, identifier (Name) column pinned beside it.
+    # Only the checkbox column is pinned (left-0) now; a scroll fade marks the
+    # boundary instead of also pinning the Name column at left-12.
     assert html =~ "left-0"
-    assert html =~ "left-12"
+    assert html =~ "sticky-first-col-th"
+    refute html =~ "left-12"
   end
 
   test "composite cells truncate and expose a tooltip via title", %{conn: conn} do