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**Category:** improvement **User Impact:** Mobile users can sort each channel group by recent activity or A–Z, with their choices synchronized with desktop. **Problem:** Desktop supports persistent per-group channel sorting, but mobile shows the same groups without equivalent controls or shared preferences. The earlier mobile attempt coupled sorting to unsafe dirty-state behavior that could overwrite newer cross-client changes. **Solution:** Add mobile sorting controls and encrypted NIP-78 synchronization using the existing desktop `channel-sort` contract, while retaining ordinary whole-blob last-write-wins behavior. Local state is scoped by identity and normalized relay, startup closes fetch/subscription gaps, and both clients use the same deterministic ordering rules. <details> <summary>File changes</summary> **desktop/src/features/sidebar/lib/channelSortPreference.test.mjs** Updates ordering coverage for the deterministic, cross-client A–Z comparison rule. **desktop/src/features/sidebar/lib/channelSortPreference.ts** Aligns desktop channel-name collation with mobile so synchronized preferences produce the same visible order. **mobile/lib/features/channels/channel_sort/channel_sort_manager.dart** Adds encrypted relay synchronization with safe startup gap handling, clock checks, and ordinary last-write-wins conflicts. **mobile/lib/features/channels/channel_sort/channel_sort_provider.dart** Scopes sort state to the active identity and community lifecycle. **mobile/lib/features/channels/channel_sort/channel_sort_storage.dart** Defines the desktop-compatible payload, relay-scoped cache and migration, cleanup, and shared ordering behavior. **mobile/lib/features/channels/channels_page.dart** Connects sort state to the channel page. **mobile/lib/features/channels/channels_page/body.dart** Applies each selected order to Starred, custom groups, Channels, and DMs. **mobile/lib/features/channels/channels_page/sections.dart** Adds checked Recent and A–Z actions using the existing anchored-popover UI. **mobile/test/features/channels/channel_sort/channel_sort_manager_test.dart** Covers payload adoption, encrypted publication, conflicts, timestamps, retries, and cleanup. **mobile/test/features/channels/channel_sort/channel_sort_storage_test.dart** Covers parsing, relay isolation, migration, cleanup, and ordering modes. **mobile/test/features/channels/channels_page_test.dart** Verifies the group controls expose both choices. </details> ### Reproduction steps 1. Open the mobile channel list with populated built-in and custom groups. 2. Open a group menu and choose **Sort: Recent**; confirm active channels move to the top. 3. Choose **Sort: A–Z**; confirm deterministic alphabetical ordering returns. 4. Repeat for Starred, a custom group, Channels, and DMs. 5. Open desktop with the same identity and community and confirm each synchronized preference. 6. Switch communities and confirm cached preferences do not bleed across relays. ### Screenshots Approved `live` custom-section flow with `research` kept offscreen. | Recent selected | A–Z result | A–Z selected | |---|---|---| |  |  |  | ### Validation - Mobile `flutter analyze` — clean - Focused mobile sort and channel-page suites — 37/37 passed - Desktop full suite — 3906/3906 passed - Mobile full suite — 1034 passed, 1 skipped, 1 unrelated baseline failure reproduced at `ac4fa13b8` <!-- Originating Buzz channel: 2a16a2bb-6fd3-4d69-8182-2afcb21b2d14 --> --------- Signed-off-by: Taylor Ho <taylorkmho@gmail.com> Co-authored-by: npub1223z34hd7vtwc6qj4s7flsxkj644nlre2nthu7lrrmkumhu3xddsrx9r6w <52a228d6edf316ec6812ac3c9fc0d696ab59fc7954d77e7be31eedcddf91335b@buzz.block.builderlab.xyz>