[Backport] update subscription panel for new designs (#6397)

## Summary
Backport of PR #6378 to `rh-test` branch.

## Changes
- Extract credit calculations into useSubscriptionCredits composable
- Extract action handlers into useSubscriptionActions composable
- Add comprehensive component and unit tests
- Update subscription panel layout to match Figma design exactly
- Add proper design tokens for modal card surfaces
- Update terminology from "API Nodes" to "Partner Nodes"
- Make credit breakdown dynamic with real API data
- Add proper loading states and error handling
- Remove unused tailwindcss eslint dependencies

## Conflicts Resolved
- Resolved merge conflicts in `packages/design-system/src/css/style.css`
related to button surface CSS variables

## Test plan
- Existing tests pass
- New tests for subscription composables and components

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6397-Backport-update-subscription-panel-for-new-designs-29c6d73d3650812aaa12ff242fd5e078)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: Johnpaul Chiwetelu <49923152+Myestery@users.noreply.github.com>

tests-ui/tests/platform/cloud/subscription/components/SubscriptionPanel.test.ts

@@ -0,0 +1,213 @@
+import { createTestingPinia } from '@pinia/testing'
+import { mount } from '@vue/test-utils'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { createI18n } from 'vue-i18n'
+
+import SubscriptionPanel from '@/platform/cloud/subscription/components/SubscriptionPanel.vue'
+
+// Mock composables
+const mockSubscriptionData = {
+  isActiveSubscription: false,
+  isCancelled: false,
+  formattedRenewalDate: '2024-12-31',
+  formattedEndDate: '2024-12-31',
+  formattedMonthlyPrice: '$9.99',
+  manageSubscription: vi.fn(),
+  handleInvoiceHistory: vi.fn()
+}
+
+const mockCreditsData = {
+  totalCredits: '10.00',
+  monthlyBonusCredits: '5.00',
+  prepaidCredits: '5.00',
+  isLoadingBalance: false
+}
+
+const mockActionsData = {
+  isLoadingSupport: false,
+  refreshTooltip: 'Refreshes on 2024-12-31',
+  handleAddApiCredits: vi.fn(),
+  handleMessageSupport: vi.fn(),
+  handleRefresh: vi.fn(),
+  handleLearnMoreClick: vi.fn()
+}
+
+vi.mock('@/platform/cloud/subscription/composables/useSubscription', () => ({
+  useSubscription: () => mockSubscriptionData
+}))
+
+vi.mock(
+  '@/platform/cloud/subscription/composables/useSubscriptionCredits',
+  () => ({
+    useSubscriptionCredits: () => mockCreditsData
+  })
+)
+
+vi.mock(
+  '@/platform/cloud/subscription/composables/useSubscriptionActions',
+  () => ({
+    useSubscriptionActions: () => mockActionsData
+  })
+)
+
+// Create i18n instance for testing
+const i18n = createI18n({
+  legacy: false,
+  locale: 'en',
+  messages: {
+    en: {
+      subscription: {
+        title: 'Subscription',
+        perMonth: '/ month',
+        subscribeNow: 'Subscribe Now',
+        manageSubscription: 'Manage Subscription',
+        partnerNodesBalance: 'Partner Nodes Balance',
+        partnerNodesDescription: 'Credits for partner nodes',
+        totalCredits: 'Total Credits',
+        monthlyBonusDescription: 'Monthly bonus',
+        prepaidDescription: 'Prepaid credits',
+        monthlyCreditsRollover: 'Monthly credits rollover info',
+        prepaidCreditsInfo: 'Prepaid credits info',
+        viewUsageHistory: 'View Usage History',
+        addCredits: 'Add Credits',
+        yourPlanIncludes: 'Your plan includes',
+        learnMore: 'Learn More',
+        messageSupport: 'Message Support',
+        invoiceHistory: 'Invoice History',
+        renewsDate: 'Renews {date}',
+        expiresDate: 'Expires {date}'
+      }
+    }
+  }
+})
+
+function createWrapper(overrides = {}) {
+  return mount(SubscriptionPanel, {
+    global: {
+      plugins: [createTestingPinia({ createSpy: vi.fn }), i18n],
+      stubs: {
+        CloudBadge: true,
+        SubscribeButton: true,
+        SubscriptionBenefits: true,
+        Button: {
+          template:
+            '<button @click="$emit(\'click\')" :disabled="loading" :data-testid="label" :data-icon="icon">{{ label }}</button>',
+          props: [
+            'loading',
+            'label',
+            'icon',
+            'text',
+            'severity',
+            'size',
+            'iconPos',
+            'pt'
+          ],
+          emits: ['click']
+        },
+        Skeleton: {
+          template: '<div class="skeleton"></div>'
+        }
+      }
+    },
+    ...overrides
+  })
+}
+
+describe('SubscriptionPanel', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  describe('subscription state functionality', () => {
+    it('shows correct UI for active subscription', () => {
+      mockSubscriptionData.isActiveSubscription = true
+      const wrapper = createWrapper()
+      expect(wrapper.text()).toContain('Manage Subscription')
+      expect(wrapper.text()).toContain('Add Credits')
+    })
+
+    it('shows correct UI for inactive subscription', () => {
+      mockSubscriptionData.isActiveSubscription = false
+      const wrapper = createWrapper()
+      expect(wrapper.findComponent({ name: 'SubscribeButton' }).exists()).toBe(
+        true
+      )
+      expect(wrapper.text()).not.toContain('Manage Subscription')
+      expect(wrapper.text()).not.toContain('Add Credits')
+    })
+
+    it('shows renewal date for active non-cancelled subscription', () => {
+      mockSubscriptionData.isActiveSubscription = true
+      mockSubscriptionData.isCancelled = false
+      const wrapper = createWrapper()
+      expect(wrapper.text()).toContain('Renews 2024-12-31')
+    })
+
+    it('shows expiry date for cancelled subscription', () => {
+      mockSubscriptionData.isActiveSubscription = true
+      mockSubscriptionData.isCancelled = true
+      const wrapper = createWrapper()
+      expect(wrapper.text()).toContain('Expires 2024-12-31')
+    })
+  })
+
+  describe('credit display functionality', () => {
+    it('displays dynamic credit values correctly', () => {
+      const wrapper = createWrapper()
+      expect(wrapper.text()).toContain('$10.00') // totalCredits
+      expect(wrapper.text()).toContain('$5.00') // both monthlyBonus and prepaid
+    })
+
+    it('shows loading skeleton when fetching balance', () => {
+      mockCreditsData.isLoadingBalance = true
+      const wrapper = createWrapper()
+      expect(wrapper.findAll('.skeleton').length).toBeGreaterThan(0)
+    })
+
+    it('hides skeleton when balance loaded', () => {
+      mockCreditsData.isLoadingBalance = false
+      const wrapper = createWrapper()
+      expect(wrapper.findAll('.skeleton').length).toBe(0)
+    })
+  })
+
+  describe('action buttons', () => {
+    it('should call handleLearnMoreClick when learn more is clicked', async () => {
+      const wrapper = createWrapper()
+      const learnMoreButton = wrapper.find('[data-testid="Learn More"]')
+      await learnMoreButton.trigger('click')
+      expect(mockActionsData.handleLearnMoreClick).toHaveBeenCalledOnce()
+    })
+
+    it('should call handleMessageSupport when message support is clicked', async () => {
+      const wrapper = createWrapper()
+      const supportButton = wrapper.find('[data-testid="Message Support"]')
+      await supportButton.trigger('click')
+      expect(mockActionsData.handleMessageSupport).toHaveBeenCalledOnce()
+    })
+
+    it('should call handleRefresh when refresh button is clicked', async () => {
+      const wrapper = createWrapper()
+      // Find the refresh button by icon
+      const refreshButton = wrapper.find('[data-icon="pi pi-sync"]')
+      await refreshButton.trigger('click')
+      expect(mockActionsData.handleRefresh).toHaveBeenCalledOnce()
+    })
+  })
+
+  describe('loading states', () => {
+    it('should show loading state on support button when loading', () => {
+      mockActionsData.isLoadingSupport = true
+      const wrapper = createWrapper()
+      const supportButton = wrapper.find('[data-testid="Message Support"]')
+      expect(supportButton.attributes('disabled')).toBeDefined()
+    })
+
+    it('should show loading state on refresh button when loading balance', () => {
+      mockCreditsData.isLoadingBalance = true
+      const wrapper = createWrapper()
+      const refreshButton = wrapper.find('[data-icon="pi pi-sync"]')
+      expect(refreshButton.attributes('disabled')).toBeDefined()
+    })
+  })
+})