Filter draft cards from public closed column (#2667)

The public closed column was showing draft cards because it queried
`@board.cards.closed` without a `.published` filter. This adds the
missing `.published` scope to match the pattern used elsewhere in the
public controllers.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

test/controllers/public/boards/columns/closeds_controller_test.rb

@@ -9,4 +9,14 @@ class Public::Boards::Columns::ClosedsControllerTest < ActionDispatch::Integrati
     get public_board_columns_closed_path(boards(:writebook).publication.key)
     assert_response :success
   end
+
+  test "show excludes draft cards" do
+    draft_card = cards(:buy_domain)
+    draft_card.update!(status: :drafted)
+    Current.set(user: users(:david)) { draft_card.close }
+
+    get public_board_columns_closed_path(boards(:writebook).publication.key)
+    assert_response :success
+    assert_not_includes response.body, draft_card.title
+  end
 end

test/controllers/public/boards_controller_test.rb

@@ -21,6 +21,16 @@ class Public::BoardsControllerTest < ActionDispatch::IntegrationTest
     assert_response :not_found
   end
 
+  test "show excludes draft cards from closed count" do
+    draft_card = cards(:buy_domain)
+    draft_card.update!(status: :drafted)
+    Current.set(user: users(:david)) { draft_card.close }
+
+    get published_board_path(boards(:writebook))
+    assert_response :success
+    assert_select ".cards--closed .cards__expander-count", "1"
+  end
+
   test "show works without authentication" do
     sign_out
     get published_board_path(boards(:writebook))