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<!-- Draft PR body for #7382 · fix(mobile): hydrate and refresh relay presence snapshots · https://github.com/block/buzz/pull/7382 --> 🤖 ## Summary Mobile showed every person in a DM as **Offline** until they happened to publish a presence update while the app was connected. Presence was never loaded when the app opened, never refreshed, and a missing or failed read looked identical to actually being offline. This PR makes presence load and stay current: on connect or foreground, the app fetches the relay's presence snapshot for everyone visible, keeps the live subscription open while it does, and re-checks every 60 seconds while the app is in the foreground. A missing or failed read shows **Unknown** (no dot), not Offline. - Snapshot reads are authenticated like the rest of the session and batched by exact key (at most 100 per batch), instead of relying on live events only. - The live subscription opens before the snapshot, so updates published during the read are not dropped. Per-key revisions fence stale **query completions**: a snapshot that finishes after newer live evidence for that key does not overwrite it. - Refreshing every 60 foreground seconds observes relay lease expiry and retry failures; missing or failed evidence simply stays absent — it is never reported as Offline. - Disconnects, backgrounding, and account/community changes reset the cache cleanly. The app's existing subscription/recovery machinery is reused rather than duplicated. Mirrors Desktop's presence hydration (`desktop/src-tauri/src/commands/profile.rs::get_presence`, `desktop/src/features/presence/hooks.ts`). ### Presence contract: best effort between polls Presence is a best-effort estimate that the next foreground poll corrects. This PR does not give strict causal order between snapshots and live events: - Snapshots carry relay time. Live kind:20001 events carry the signer's time. These clocks are not comparable. - A live event at or below a snapshot's relay second is not applied directly. The client confirms it with a fresh snapshot. This works because the relay persists presence before fan-out. - An empty (all-Offline) snapshot carries no relay second. If the relay stored an Online event, then its fan-out was delayed past lease expiry and an empty snapshot, the delayed event can show Online/Away until the next 60-second poll. Base `main` has the same stale-delivery exposure with no correction at all. Strict ordering needs relay-issued ordering metadata on both paths, or a fresh confirmation for every live event. Both are protocol or latency tradeoffs and are out of scope here. ### Related issue - Fixes: N/A. Closest open duplicates: #4417 (larger presence bootstrap + UI patch), #5617. Related: #6200, #7295. - First slice of the mobile remote-agent parity port. This PR includes the Unknown rendering at all three consumers (DM header, channel tile, profile sheet). #7383 and #7526 stack on it and add test coverage only. ### Testing - Rebased on `main` `95b018c87` (2026-09-30). At stack tip `7c8a93081`: `just mobile-check` clean; full `just mobile-test` **2,593 passed**. Earlier receipts below apply to the pre-rebase head. - Regressions cover cold-open hydration, live/snapshot races, lease expiry, failed reads and retries, disconnect/background/scope changes, and >100-key batching. - At the branch head: `just mobile-check` and the full mobile test suite pass independently, and every broader CI gate has successful evidence after isolated recovery runs (no monolithic local `just ci` run) — receipts in the [exact-head evidence comment](https://github.com/block/buzz/pull/7382#issuecomment-5573112882). - Verification is automated-test level; no native device or simulator run is claimed. No layout change in this slice. ### Screenshots No layout change in this slice — the renders below show the same existing profile sheet, with the presence status now following hydrated relay data. Flutter production-widget test renders — not native-device screenshots or acceptance captures. | Scenario | Before | After | |---|---|---| | Existing profile opened cold, with a signed relay snapshot saying Online |  |  | <details> <summary>Capture provenance</summary> Rendered by the Flutter widget engine in a `flutter test` run (production widgets, production theme; no device or simulator). Before: this PR's declared base `3c7f288c60d67df78577b237e27c3dfc8831aaa1`. After: its head `a8e8028bfb9bb67de2db03ed448839e2f3ab2b0d`. </details> Signed-off-by: Logan Johnson <loganj@squareup.com>