[WIP] Use mcp-apps-testing from npm instead of embedding

[Copilot]

Plan to use mcp-apps-testing from npm

• Add mcp-apps-testing npm package as a dev dependency in ui/package.json
• Update the import in ui/mcp-apps.spec.ts to use the npm package instead of local directory
• Remove the "Build mcp-apps-testing framework" step from .github/workflows/test.yml
• Remove the local ui/mcp-apps-testing directory from the repository
• Run tests to verify the changes work correctly
• Update documentation to reflect the changes
• Clean up .gitignore to remove obsolete references

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Feature]: use mcp-apps-testing from npm instead of locally embedding</issue_title>
<issue_description>### Is your feature request related to a problem?

use mcp-apps-testing from npm instead of locally embedding

https://www.npmjs.com/package/mcp-apps-testing

Describe the solution you'd like

Once it's available on npm, use it.

Describe alternatives you've considered

No response

Additional context

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Feature]: use mcp-apps-testing from npm instead of locally embedding #28

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