## 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>
## Summary
<!-- One sentence describing what changed and why. -->
## Changes
- **What**: <!-- Core functionality added/modified -->
- **Breaking**: <!-- Any breaking changes (if none, remove this line)
-->
- **Dependencies**: <!-- New dependencies (if none, remove this line)
-->
## Review Focus
<!-- Critical design decisions or edge cases that need attention -->
<!-- If this PR fixes an issue, uncomment and update the line below -->
<!-- Fixes #ISSUE_NUMBER -->
## Screenshots (if applicable)
<!-- Add screenshots or video recording to help explain your changes -->
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6043-Comfy-Cloud-Badge-indicator-28b6d73d365081b8b549ecc3beb2c132)
by [Unito](https://www.unito.io)
