Use promiseExit in OAuth source UI

[RhysSullivan]

Summary

• switch OAuth source UI mutations to promiseExit
• preserve failed mutation paths as stable UI errors instead of reading unknown error messages
• keep source placeholder cleanup explicit around mutation exits

Verification

• bunx oxlint -c .oxlintrc.jsonc packages/plugins/mcp/src/react/AddMcpSource.tsx packages/plugins/mcp/src/react/EditMcpSource.tsx packages/react/src/plugins/oauth-sign-in.tsx --deny-warnings
• git diff --check
• bun run typecheck (packages/react)
• bun run typecheck (packages/plugins/mcp)

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commit: f78d51d

[RhysSullivan]

Closing as superseded by focused PRs: #643 covers AddMcpSource, #645 covers oauth-sign-in, and #682 preserves the unique EditMcpSource cleanup.