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**Category:** improvement **User Impact:** Mobile readers can jump directly to their oldest unread message and return to the latest message with compact directional controls. **Problem:** Opening an active channel at its newest message makes it easy to miss where unread conversation began, while moving back through history lacks a lightweight route to the live edge. **Solution:** Capture the channel's unread boundary when it opens, offer an accessible up-chevron beneath the app bar to reach that stable target, then reveal the inverse down-chevron at the bottom whenever the reader is away from latest. Deep links retain precedence, and live-follow, pagination, composer resizing, and explicit scroll ownership continue to use the existing timeline behavior. <details> <summary>File changes</summary> **mobile/lib/features/channels/channel_detail_page.dart** Captures the channel's read state at open time and passes a stable unread snapshot into the timeline before the normal deferred read update advances it. **mobile/lib/features/channels/channel_detail_page/message_list.dart** Adds mutually exclusive oldest-unread and latest navigation, with accessible icon controls positioned at opposite edges of the message surface while preserving existing follow and deep-link behavior. **mobile/test/features/channels/channel_detail_page_test.dart** Covers the unread target, compact inverse controls, accessible tooltips, and placement beneath the frosted app bar. </details> ## Reproduction steps 1. Open a Flutter mobile channel that has unread messages without entering through a message or thread deep link. 2. Confirm an up-chevron appears directly below the channel app bar while the timeline remains at latest. 3. Tap the up-chevron and confirm the timeline scrolls to the oldest message that was unread when the channel opened. 4. Confirm the unread control is replaced by a down-chevron at the bottom of the timeline. 5. Tap the down-chevron and confirm the timeline returns to latest and resumes following new messages. ## Screenshots | At latest — up-chevron to oldest unread | Away from latest — down-chevron to latest | |---|---| |  |  | _Real iPhone 17 Pro Simulator captures from the neutral `buzz-mobile-scroll-to` channel._ Originating Buzz thread: `buzz://message?channel=5b16c478-22d8-4ddd-951a-6036e19b81ff&id=6a78af32d7ac6f531b182c4e70dd5a04c503a2dab2ce2c0c74b2c6baa5921741&thread=6a78af32d7ac6f531b182c4e70dd5a04c503a2dab2ce2c0c74b2c6baa5921741` --------- Signed-off-by: Taylor Ho <taylorkmho@gmail.com> Signed-off-by: npub1223z34hd7vtwc6qj4s7flsxkj644nlre2nthu7lrrmkumhu3xddsrx9r6w <52a228d6edf316ec6812ac3c9fc0d696ab59fc7954d77e7be31eedcddf91335b@buzz.block.builderlab.xyz> Co-authored-by: npub1223z34hd7vtwc6qj4s7flsxkj644nlre2nthu7lrrmkumhu3xddsrx9r6w <52a228d6edf316ec6812ac3c9fc0d696ab59fc7954d77e7be31eedcddf91335b@buzz.block.builderlab.xyz>
