fix(tests): tolerate .abbreviated formatter "3m ago" output

[variablefate]

Summary

RoadFlareTests/PresentationTypesTests/lastLocationTimestampLabelIsRelativeString flakes under parallel xcodebuild test but passes in isolation. Production code uses RelativeDateTimeFormatter with unitsStyle = .abbreviated and an injected en_US locale — that combination produces either "3 min. ago" or "3m ago" depending on the runner process's CFLocale/ICU resource state. Fresh simulator "Clone N" processes spawned for parallel testing consistently produce the narrower "3m ago" form, which the previous label.contains("min") assertion rejected.

The hypothesis that another test was mutating shared locale state turned out not to be the cause — RelativeDateTimeFormatter.UnitsStyle has no .narrow member, no test mutates global locale, and a single-process concurrent stress test on macOS Foundation produces "3m ago" 200/200 deterministically. The variance is process-level resource initialization, not state mutation.

Production behavior is intentional (.abbreviated is the right UX for that label), so the fix tightens only the test assertion to accept either output:

#expect(label.contains("min") || label.contains("m ago"))

Test plan

• Reproduced the flake on main — full parallel suite fails with (label → "3m ago").contains("min") on first attempt
• Full parallel xcodebuild test (200 unit tests) — target test passes after fix
• xcodebuild test -only-testing:RoadFlareTests/DriverDetailViewState — passes
• Full unit-test suite under parallel testing (-skip-testing:RoadFlareUITests) — passes
• gitnexus_detect_changes — risk: low, 0 affected processes

Notes

While reproducing, I observed 4 unrelated pre-existing failures in ChatCoordinatorTests, RideCoordinatorTests, and a RoadFlareUITests-Runner accessibility-load timeout that did not recur on subsequent runs. Those look like separate async-timing flakes worth tracking but are out of scope for this PR.

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[variablefate]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

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