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**Category:** new-feature **User Impact:** Mobile now keeps each community’s appearance in sync with desktop, including theme, accent, and system-mode preference. **Problem:** Appearance choices were device-local, so the same account could look different between desktop and mobile. Live sync could also stop after the relay closed a subscription. **Solution:** Store each community’s encrypted appearance preference on its relay using the shared desktop wire contract, restore it from a local identity-scoped cache, and apply replacement events live. Closed subscriptions now recover with guarded backoff and fetch the latest preference so no update is lost during the gap. <details> <summary>File changes</summary> **mobile/lib/app.dart** Connects community appearance state to the authenticated app lifecycle. **mobile/lib/features/settings/accent_picker_page.dart** Aligns mobile accent choices and selection behavior with the shared catalog. **mobile/lib/features/settings/settings_page/appearance_section.dart** Clarifies the active appearance and hides accent controls when the Buzz theme owns its neutral accent. **mobile/lib/features/settings/theme_picker_page.dart** Persists catalog theme choices through the community-scoped provider. **mobile/lib/shared/theme/accent_colors.dart** Matches desktop’s accent catalog and wire values. **mobile/lib/shared/theme/buzz_theme.dart** Keeps Buzz visually neutral without discarding the user’s stored accent for other themes. **mobile/lib/shared/theme/community_theme_preference.dart** Defines and validates the versioned desktop-compatible appearance payload. **mobile/lib/shared/theme/community_theme_provider.dart** Coordinates cache-first appearance loading with account and community changes. **mobile/lib/shared/theme/community_theme_sync.dart** Adds encrypted NIP-78 relay persistence, live replacement handling, deterministic ordering, safe seeding, and resilient subscription recovery. **mobile/lib/shared/theme/theme.dart** Exports the community appearance modules. **mobile/test/features/settings/theme_picker_page_test.dart** Covers the updated settings behavior. **mobile/test/shared/crypto/nip44_interop_test.dart** Proves Dart decrypts a desktop-produced nostr-rs NIP-44 v2 preference. **mobile/test/shared/theme/buzz_theme_test.dart** Covers Buzz’s neutral rendering and stored-accent restoration. **mobile/test/shared/theme/community_theme_preference_test.dart** Covers wire parsing, validation, migration, and future-version handling. **mobile/test/shared/theme/community_theme_sync_test.dart** Covers cache/relay lifecycle, replacement ordering, switching races, absence-only seeding, and closed-subscription recovery. </details> ## Reproduction steps 1. Sign into desktop and mobile with the same account and join the same community relay. 2. On desktop, choose a distinctive non-Buzz theme and accent; mobile should update without a local toggle. 3. Restart mobile and confirm it restores the same appearance. 4. Change the mobile theme and accent and confirm desktop follows. 5. Leave mobile idle or backgrounded through a relay reconnect, then change desktop again; mobile should resubscribe and catch up automatically. 6. Switch communities and confirm each community restores only its own appearance. --------- Signed-off-by: Taylor Ho <taylorkmho@gmail.com> Co-authored-by: npub1223z34hd7vtwc6qj4s7flsxkj644nlre2nthu7lrrmkumhu3xddsrx9r6w <52a228d6edf316ec6812ac3c9fc0d696ab59fc7954d77e7be31eedcddf91335b@buzz.block.builderlab.xyz>