[kalvinnchau]

Summary

Fixes two timing-dependent Vitest failures, one on main and one seen on this PR's CI. Both changes are test-only; product code is unchanged.

Test	Failure	Class
StatusEditor.test.tsx › prefills and preserves an existing deadline…	Unable to find role="button" and name /^Today,/ (main run)	Real-clock dependency (month boundary)
RelayStaff.test.tsx › enforcement error finished while closed reaches reopened detail	expect(element).toBeVisible() on .buzz-toast-title (PR run)	Synchronous assertion racing a mount effect

1. StatusEditor: month-boundary clock dependency

Root cause. The test seeds an existing status with expiresAt = Date.now() + 86400. The custom date picker opens on the month of the prefilled deadline, and the test then clicks the Today, … day button. On the last day of a month (in the runner's time zone), tomorrow is in the next month. The calendar then renders that month, today's button isn't present, and findByRole times out. CI ran at 2026-10-31T00:28Z.

Opening on the month of the selected date is intended product behavior.

Fix.

• vi.useFakeTimers({ toFake: ["Date"], now: new Date(2026, 5, 15, 12) }) pins Date to a mid-month local noon, so now + 1 day stays in the same month in any time zone.
• Only Date is faked. Timers, microtasks and user-event scheduling stay real, so the existing waitFor/findBy* behavior doesn't change.
• afterEach calls vi.useRealTimers() so other tests in the file go back to the real clock.

2. RelayStaff: toast visibility before Sonner mount

Root cause. Sonner renders a new toast with data-mounted="false". Its injected stylesheet keeps a toast at opacity: 0 until a post-render effect sets data-mounted="true" ([data-sonner-toast][data-mounted='true']). The test asserted toBeVisible() right after findByRole(...) for the detail view. Depending on scheduling, the toast node existed but hadn't flipped to mounted yet, so jsdom reported it as hidden.

Fix. Wrap that assertion in waitFor(() => expect(getByText(...)).toBeVisible()), waiting on the observable mounted state instead of assuming it already happened. The assertion is just as strict as before: the toast must actually become visible. The synchronous toBeVisible() for the inline Native enforcement detail (non-toast) stays as it was.

Validation

Command	Result
bin/pnpm vitest run src/features/user-status/StatusEditor.test.tsx (local TZ)	20/20 pass
TZ=UTC bin/pnpm vitest run src/features/user-status/StatusEditor.test.tsx	20/20 pass
bin/pnpm vitest run src/bundled/relay-staff/RelayStaff.test.tsx ×3	136/136 pass each run

Deferred / gaps

• Neither original failure was reproduced locally. The month-boundary case wasn't run on a month-end date, and the Sonner race isn't deterministic under local scheduling. The fixes address the mechanisms identified from the CI logs and the Sonner CSS.
• The full JavaScript and browser splits are left to hosted CI.