[DREAM-697] Migrate resource allocations list

Renders the resource allocations list through the shared
`BorderBoxListComponent` instead of a bespoke `Primer::Beta::BorderBox`,
keeping the list headerless and preserving the existing per-row list
item component and its arguments. The surrounding progress row and the
`allocations.any?` guard are kept, so an empty allocation set still
renders nothing. Adds a component spec.

https://community.openproject.org/wp/DREAM-697

Author: myabc

modules/resource_management/app/components/resource_allocations/list_component.html.erb

@@ -34,9 +34,13 @@ See COPYRIGHT and LICENSE files for more details.
     <% end %>
     <% if allocations.any? %>
       <%= body.with_row do %>
-        <%= render(Primer::Beta::BorderBox.new) do |box| %>
+        <%= render(
+              OpenProject::Common::BorderBoxListComponent.new(
+                container: "resource-allocations-#{work_package.id}"
+              )
+            ) do |list| %>
           <% allocations.each do |allocation| %>
-            <% box.with_row do %>
+            <% list.with_item do %>
               <%= render ResourceAllocations::ListItemComponent.new(
                     allocation:,
                     project:,

modules/resource_management/spec/components/resource_allocations/list_component_spec.rb

@@ -0,0 +1,68 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+require "rails_helper"
+
+RSpec.describe ResourceAllocations::ListComponent, type: :component do
+  shared_let(:work_package) { create(:work_package) }
+  shared_let(:member) { create(:user, firstname: "Sarah", lastname: "Smith") }
+
+  before { login_as(create(:admin)) }
+
+  subject(:rendered_component) do
+    render_inline(
+      described_class.new(
+        project: work_package.project,
+        work_package:,
+        allocations:,
+        visible_principal_ids: [member.id]
+      )
+    )
+  end
+
+  context "with allocations" do
+    let!(:allocation) { create(:resource_allocation, entity: work_package, principal: member) }
+    let(:allocations) { [allocation] }
+
+    it_behaves_like "rendering Box", row_count: 1, header: false
+
+    it "renders a row per allocation" do
+      expect(rendered_component).to have_css(".Box-row", text: "Sarah Smith")
+    end
+  end
+
+  context "without allocations" do
+    let(:allocations) { [] }
+
+    it "does not render the list box" do
+      expect(rendered_component).to have_no_css("#resource-allocations-#{work_package.id}")
+    end
+  end
+end