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Mobile previously exposed no way to browse or join channels. Users can now browse and join eligible open channels from the Home quick-actions menu. The public directory loads on demand when Browse channels opens, while the existing kind 9021 join path refreshes membership after success. | Browse channels | Join channel | | --- | --- | | <img width="320" alt="Browse channels" src="https://github.com/user-attachments/assets/f12c46c8-8bf4-487d-8a45-7bec63b16028" /> | <img width="320" alt="Join channel" src="https://github.com/user-attachments/assets/d6306ca7-9ab8-4f5a-8131-7f9b2a76d653" /> | ### How is it tested? Manually tested (see screenshots) and added tests: - [`channels_provider_test.dart`](https://github.com/block/buzz/blob/main/mobile/test/features/channels/channels_provider_test.dart) covers access filtering, independently paginated membership and directory queries, relay-capped pages, repeated-page termination, hard page caps, on-demand directory loading, load failures, retry, and cached-channel retention. - [`channels_page_test.dart`](https://github.com/block/buzz/blob/main/mobile/test/features/channels/channels_page_test.dart) covers browse eligibility, loading and retry states, quick-action layout, and scrolling and joining from a 500-channel directory. - [`search_page_test.dart`](https://github.com/block/buzz/blob/main/mobile/test/features/search/search_page_test.dart) covers discoverable open-channel results without presenting unknown membership counts as zero. Local validation: - `just mobile-check` - `just mobile-test` (1,560 tests) - full pre-push gate --------- Signed-off-by: Tom Brow <tomb@block.xyz> Co-authored-by: Codex <noreply@openai.com> Co-authored-by: leader <71e9f2c44a6932b6772caaaccda1911d010463c3e2c6c40410b8329956046801@buzz.block.builderlab.xyz>