Enable
[`sequence.concurrent`](https://vitest.dev/config/sequence.html#sequence-concurrent)
to run all js tests in parallel. This will help catch potential
concurrency bugs in the future. The "Repository Branch Settings" test
was not concurrency-safe, it was refactored to remove shared mutable
state.
Co-Authored-By: Claude (claude-opus-4-6) <noreply@anthropic.com>
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Co-authored-by: Claude (claude-opus-4-6) <noreply@anthropic.com>