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## Summary - Keep mobile thread reply badges current by merging relay recounts with replies observed locally. - Retain replies in the local channel store while continuing to filter them from the main timeline. - Match the thread summary behavior already used on desktop, including the reply count, latest reply time, and participant avatars. ## Why On mobile, the "N replies" badge under a channel message can stall at a stale count or remain missing after a reply arrives. This makes the badge unreliable and can cause people to miss replies. The badge has two inputs: best-effort recounts from the relay and replies the client sees arrive. Mobile previously let any positive relay recount override the local view, while also discarding replies from its local message store. A delayed or lost recount, or a reply received after the recount, could therefore leave the badge behind. This change combines both inputs by using the higher reply count, the later last-reply time, and a merged participant list. Relay timestamps have one-second precision, so equal timestamps do not prove that a recount included a locally observed reply. Comparing counts preserves that reply instead of trusting recency alone. Desktop already uses this merge behavior. ## Validation At commit `4e3356636f5ad62e8f07910af305c532186c6c08` with a clean worktree: - `flutter test` for mobile: 1105 passed, 1 skipped - `flutter analyze` for mobile: no issues found - Reverting the merge so a positive relay recount shadows local replies fails 4 of the new tests, including the same-second and reply-after-recount cases. Restoring the store-level reply drop fails both new provider tests. Added tests: - [`timeline_message_test.dart`](https://github.com/block/buzz/tree/main/mobile/test/features/channels/timeline_message_test.dart), covering relay-only recounts, a reply newer than the recount, a reply in the same second as the recount, a lost recount, a zero recount, nested replies at the root and at the reply they answer, a deleted reply, and participant merging and capping. - [`channel_messages_provider_test.dart`](https://github.com/block/buzz/tree/main/mobile/test/features/channels/channel_messages_provider_test.dart), covering a live reply reaching the store while staying out of the main timeline, and a reply newer than the relay recount raising the badge. --------- Signed-off-by: Tom Brow <tomb@block.xyz> Co-authored-by: npub12uu53ml9upy7ww9apmtv6vm0u8xlcldx7znsjvwgsr7uvy5g0kssw943ca <573948efe5e049e738bd0ed6cd336fe1cdfc7da6f0a70931c880fdc612887da1@buzz.block.builderlab.xyz>