Initial commit: Add logistics and order_detail message types

- Add Logistics component with progress tracking
- Add OrderDetail component for order information
- Support data-driven steps and actions
- Add blue color scale to widget SCSS
- Fix node overflow and progress bar rendering issues
- Add English translations for dashboard components

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

spec/enterprise/models/inbox_capacity_limit_spec.rb

@@ -0,0 +1,33 @@
+require 'rails_helper'
+
+RSpec.describe InboxCapacityLimit, type: :model do
+  let(:account) { create(:account) }
+  let(:policy) { create(:agent_capacity_policy, account: account) }
+  let(:inbox) { create(:inbox, account: account) }
+
+  describe 'validations' do
+    subject { create(:inbox_capacity_limit, agent_capacity_policy: policy, inbox: inbox) }
+
+    it { is_expected.to validate_presence_of(:conversation_limit) }
+    it { is_expected.to validate_numericality_of(:conversation_limit).is_greater_than(0).only_integer }
+    it { is_expected.to validate_uniqueness_of(:inbox_id).scoped_to(:agent_capacity_policy_id) }
+  end
+
+  describe 'uniqueness constraint' do
+    it 'prevents duplicate inbox limits for the same policy' do
+      create(:inbox_capacity_limit, agent_capacity_policy: policy, inbox: inbox)
+      duplicate = build(:inbox_capacity_limit, agent_capacity_policy: policy, inbox: inbox)
+
+      expect(duplicate).not_to be_valid
+      expect(duplicate.errors[:inbox_id]).to include('has already been taken')
+    end
+
+    it 'allows the same inbox in different policies' do
+      other_policy = create(:agent_capacity_policy, account: account)
+      create(:inbox_capacity_limit, agent_capacity_policy: policy, inbox: inbox)
+
+      different_policy_limit = build(:inbox_capacity_limit, agent_capacity_policy: other_policy, inbox: inbox)
+      expect(different_policy_limit).to be_valid
+    end
+  end
+end