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/controllers/linear/callbacks_controller_spec.rb

@@ -0,0 +1,88 @@
+require 'rails_helper'
+
+RSpec.describe Linear::CallbacksController, type: :request do
+  let(:account) { create(:account) }
+  let(:code) { SecureRandom.hex(10) }
+  let(:client_secret) { 'test_linear_secret' }
+  let(:state) { JWT.encode({ sub: account.id, iat: Time.current.to_i }, client_secret, 'HS256') }
+  let(:linear_redirect_uri) { "#{ENV.fetch('FRONTEND_URL', '')}/app/accounts/#{account.id}/settings/integrations/linear" }
+
+  describe 'GET /linear/callback' do
+    let(:access_token) { SecureRandom.hex(10) }
+    let(:response_body) do
+      {
+        'access_token' => access_token,
+        'token_type' => 'Bearer',
+        'expires_in' => 7200,
+        'scope' => 'read,write'
+      }
+    end
+
+    before do
+      stub_const('ENV', ENV.to_hash.merge('FRONTEND_URL' => 'http://www.example.com'))
+      allow(GlobalConfigService).to receive(:load).and_call_original
+      allow(GlobalConfigService).to receive(:load).with('LINEAR_CLIENT_SECRET', nil).and_return(client_secret)
+      allow(GlobalConfigService).to receive(:load).with('LINEAR_CLIENT_ID', nil).and_return('test_client_id')
+    end
+
+    context 'when successful' do
+      before do
+        stub_request(:post, 'https://api.linear.app/oauth/token')
+          .to_return(
+            status: 200,
+            body: response_body.to_json,
+            headers: { 'Content-Type' => 'application/json' }
+          )
+      end
+
+      it 'creates a new integration hook' do
+        expect do
+          get linear_callback_path, params: { code: code, state: state }
+        end.to change(Integrations::Hook, :count).by(1)
+
+        hook = Integrations::Hook.last
+        expect(hook.access_token).to eq(access_token)
+        expect(hook.app_id).to eq('linear')
+        expect(hook.status).to eq('enabled')
+        expect(hook.settings).to eq(
+          'token_type' => 'Bearer',
+          'expires_in' => 7200,
+          'scope' => 'read,write'
+        )
+        expect(response).to redirect_to(linear_redirect_uri)
+      end
+    end
+
+    context 'when the code is missing' do
+      before do
+        stub_request(:post, 'https://api.linear.app/oauth/token')
+          .to_return(
+            status: 200,
+            body: response_body.to_json,
+            headers: { 'Content-Type' => 'application/json' }
+          )
+      end
+
+      it 'redirects to the linear_redirect_uri' do
+        get linear_callback_path, params: { state: state }
+        expect(response).to redirect_to(linear_redirect_uri)
+      end
+    end
+
+    context 'when the token is invalid' do
+      before do
+        stub_request(:post, 'https://api.linear.app/oauth/token')
+          .to_return(
+            status: 400,
+            body: { error: 'invalid_grant' }.to_json,
+            headers: { 'Content-Type' => 'application/json' }
+          )
+      end
+
+      it 'redirects to the linear_redirect_uri' do
+        get linear_callback_path, params: { code: code, state: state }
+        expect(response).to redirect_to(linear_redirect_uri)
+      end
+    end
+  end
+end