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Every Lotus setting was localStorage-only, so a user on web + desktop + phone configured theme, composer toolbar, quiet hours, call keys… three times. - utils/settingsSync.ts (pure, 7 tests): DEVICE_LOCAL_KEYS denylist (zoom, media auto-load, animation pause, glassmorphism, denoise tier/model, bitrates, volumes, notification permission, developer tools, PTT mode, camera-on-join, drawer state, and the sync toggle itself), pickSyncable, mergeRemoteSettings (unknown keys, device-local keys and wrong-shaped values are skipped), buildSyncedContent, shouldApplyRemote (LWW on updatedAt; equal stamp = our own echo). - hooks/useSettingsSync.ts: on start applies a newer remote snapshot or pushes local if it differs; debounced push on any settingsAtom write, skipped when the syncable subset equals the last pushed/applied snapshot so a remote apply never echoes back; AccountData listener for live updates; stamps forced monotonic per device; per-account lastSyncedAt marker so another user on the same device can't inherit it; failed pushes roll the marker back so the next change retries. Remote values are re-read through getSettings() so enum coercion applies. - Settings → General → Sync: toggle (device-local), "Push now", "Clear synced copy". AccountDataEvent.LotusSettings registered. - ClientNonUIFeatures: the #103 tracking-param subscriber moves out of PageZoomFeature into its own TrackingParamsFeature next to SettingsSyncFeature. - Docs: LOTUS_FEATURES entries for #103/#104; LOTUS_TODO links the new Features 2026-Q4 milestone and #108. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA