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🤖 ## Summary This PR adds tests only. It locks in how the mobile app shows a member as Online or Offline when a live presence update arrives late. The app learns presence two ways: a periodic snapshot from the relay (the server), and live updates sent by each member's device. These use different clocks. A live update can reach the phone after a newer snapshot already counted it. Without a guard, that late update could flip a member to the wrong state until the next 60-second refresh. The guard itself already shipped in #7382 (see `presence_cache_provider.dart` on `main`). This PR adds the tests that prove it keeps working: - A late `offline` update, signed before the snapshot, does not show the member as Offline. The app asks the relay for one fresh snapshot instead. - A real change from a device whose clock runs behind the relay is not dropped. The fresh snapshot confirms it, and the member shows as Offline. - An update signed in the same second as the snapshot is not trusted directly in either direction (Online→Offline or Offline→Online). The app confirms it with a fresh snapshot. - If the same late update is delivered twice, the app asks for only one confirmation. No production code changes. No UI changes. ### Related issue Follow-up to #7382 (snapshot/live ordering, review item 2). It is the last PR in the #7382 → #7383 → #7526 stack; both parents have merged. None found beyond this stack. ### Testing The new file `mobile/test/features/profile/presence_ordering_test.dart` drives the real presence cache through a fake relay session and fake time. On this head, rebased on current `main`: `dart format` clean, `flutter analyze` clean, and the profile test suite passes (139 tests). Signed-off-by: Logan Johnson <loganj@squareup.com>