Update mcp extension

[radzio]

Description

This PR fixes #17839

Screencast

Checklist

• I read the extension guidelines
• I read the documentation about publishing
• I ran npm run build and tested this distribution build in Raycast
• I checked that files in the assets folder are used by the extension itself
• I checked that assets used by the README are placed outside of the metadata folder

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[greptile-apps]

PR Summary

This PR adds environment variable handling improvements to the MCP extension, specifically addressing client initialization failures by properly sourcing shell environment variables.

• Added new initEnv() function in /extensions/mcp/src/getProcessedClients.ts to properly load shell environment variables
• Added changelog entry "Fix issue caused by passing env in mcp-config.json" in /extensions/mcp/CHANGELOG.md
• Consider using showFailureToast from @raycast/utils in the catch blocks of initEnv() and getUserShellPath()
• Recommend wrapping raycastAiClientInstance.connect() calls in try-catch blocks for better error handling

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[EvanZhouDev]

@radzio LGTM, probably just fix the lint error 😄

[radzio]

@radzio LGTM, probably just fix the lint error 😄

@EvanZhouDev Consider it done :)