With accessibility semantics active, opening and leaving channels
retained disposed composer overlay states through Flutter’s semantics
traversal map. Those states kept departed route and message trees alive.
This upgrades the pinned Flutter SDK from 3.41.7 to 3.47.7, which
includes [the upstream
fix](3c96406cc4).
Includes SDK compatibility and formatter changes, preserves CocoaPods
integration, and gives create-channel radio lists a Material ink surface
required by the newer framework. Widget regressions verify both the
framework portal and the production channel/composer lifecycle: departed
routes, composer elements, and portal states are collectible while their
application’s semantics owner remains alive.
Related issue: no matching open issue or PR found.
### Validation
- [Current-head CI
passed](https://github.com/block/buzz/actions/runs/39085320351): all
mobile test shards, checks, Android APK, iOS release build, and native
simulator tests.
- Framework regression fails on Flutter 3.41.7 with three retained
states and passes on 3.47.7.
- Signed native Debug iOS Simulator build and paired-community
navigation replay: after 18 channel visits and forced GC, retained
disposed portal keys fell from 18 to 0 and route instances from 19 to 1.
- Review follow-up: all 365 focused channel/overlay tests, analyzer, and
complete mobile pre-push checks passed.
- Full local CI passed before the test-only review follow-up, including
Rust and desktop validation, frontend builds, analyzer checks, 3,499
mobile tests (four skipped), and the separate unconfigured-push test.
The replay used iOS 26.5 Simulator with accessibility semantics enabled,
CPU profiling disabled, and Debug/JIT builds. The before app was a
preinstalled emoji candidate; the after app uses this branch. Object
retention and the focused regression establish the fix; absolute heap
differences are not a controlled release-memory measurement. Android
native execution was not tested.
### Create-channel compatibility
The radio groups retain their layout after switching their container to
Material.
| Before (3.41.7) | After (3.47.7) |
| --- | --- |
| <img
src="https://raw.githubusercontent.com/block/buzz/42525e1bd9d9f264d0142c34ec61dbb6937ef758/pr-8419--01-before.png"
width="280" alt="Original create-channel radio groups"> | <img
src="https://raw.githubusercontent.com/block/buzz/42525e1bd9d9f264d0142c34ec61dbb6937ef758/pr-8419--02-after.png"
width="280" alt="Updated create-channel radio groups"> |
---------
Signed-off-by: Tom Brow <tomb@block.xyz>
**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>
