feat(member): show join_description as a tooltip on custom-field labels

test/mv_web/member_live/show_test.exs

@@ -220,4 +220,59 @@ defmodule MvWeb.MemberLive.ShowTest do
       assert html =~ "private@example.com"
     end
   end
+
+  describe "custom field join_description tooltip" do
+    test "shows a tooltip on the custom field label when join_description is set", %{
+      conn: conn,
+      member: member,
+      actor: actor
+    } do
+      {:ok, custom_field} =
+        CustomField
+        |> Ash.Changeset.for_create(:create, %{
+          name: "DSGVO",
+          value_type: :boolean,
+          join_description: "Accept the privacy policy"
+        })
+        |> Ash.create(actor: actor)
+
+      conn = conn_with_oidc_user(conn)
+      {:ok, view, html} = live(conn, ~p"/members/#{member}")
+
+      assert has_element?(view, "[data-tip*='Accept the privacy policy']")
+      # Tooltip content conveys both the join-form context and the description text.
+      assert has_element?(view, "[data-tip*='Join form:']")
+      assert html =~ "Accept the privacy policy"
+      assert html =~ custom_field.name
+
+      # The info-icon wrapper must center the icon vertically with the label,
+      # matching the flex-items-center idiom used elsewhere (e.g. custom field edit),
+      # so the icon is flush with the label text and not offset downward.
+      assert has_element?(
+               view,
+               "[data-tip*='Accept the privacy policy'].inline-flex.items-center"
+             )
+    end
+
+    test "shows no tooltip on the custom field label when join_description is nil", %{
+      conn: conn,
+      member: member,
+      actor: actor
+    } do
+      {:ok, _custom_field} =
+        CustomField
+        |> Ash.Changeset.for_create(:create, %{
+          name: "Plain field",
+          value_type: :string
+        })
+        |> Ash.create(actor: actor)
+
+      conn = conn_with_oidc_user(conn)
+      {:ok, view, _html} = live(conn, ~p"/members/#{member}")
+
+      assert has_element?(view, "dt", "Plain field")
+      # The info-icon tooltip beside the label is only rendered when join_description is set.
+      refute has_element?(view, "[data-testid='join-description-tooltip']")
+    end
+  end
 end