feat: add RooCode User-Agent header to MCP server requests

[roomote]

This PR attempts to address Issue #9810.

Summary

Adds the "User-Agent: RooCode/{version}" header to MCP server HTTP requests to match the header format used in API requests.

Changes

• Added User-Agent header to SSE transport configuration
• Added User-Agent header to StreamableHTTP transport configuration
• Imported Package module to access version information
• Ensures consistency with API request headers that use the same format

Context

Previously, MCP server requests were sending a default "User-Agent: node" header. This change ensures that MCP requests are properly identified as coming from RooCode, improving observability for MCP hosts tracking source agents.

Fixes #9810

Feedback and guidance are welcome!

[roomote]

Rooviewer   See task on Roo Cloud

Re-review completed - no new issues found.

The test fix properly addresses the timing issue by waiting for debounced effects to settle before making assertions. The implementation correctly uses act() wrappers and appropriate delays to handle React's debounced focus behavior.

Previous reviews

• 07f30b8: Review #1

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[andrewshu2000]

@roomote It's violating this test case
src/components/chat/tests/ChatView.spec.tsx > ChatView - Focus Grabbing Tests > does not grab focus when follow-up question presented
@roo-code/vscode-webview:test: AssertionError: expected "spy" to not be called at all, but actually been called 1 times

[roomote]

Fixaroo   See task on Roo Cloud

Fixed the flaky test by adding delays to wait for debounce effects to settle. All local checks passed.

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