Use promiseExit in MCP edit source

[RhysSullivan]

Summary

• split the MCP edit source promiseExit cleanup out of the older mixed React OAuth UI PR
• keep AddMcpSource and OAuth popup handling in their newer focused PRs

Verification

• bunx oxlint --format=unix packages/plugins/mcp/src/react/EditMcpSource.tsx
• bun run --cwd packages/plugins/mcp typecheck

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commit: de10d6d