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The iOS thread header currently renders an unbacked “Thread” label over scrolling messages. Supply the channel display name as its subtitle so the header uses the same two-line glass capsule as channel conversations. The title remains noninteractive and inherits the shared sizing, truncation, text scaling, and accessibility behavior. Channel and DM display names update with channel metadata; missing metadata keeps the capsule without inventing a subtitle. App-bar construction moves into a sibling file to keep the thread page within the file-size limit. ### Validation - [CI run](https://github.com/block/buzz/actions/runs/37654016581): mobile tests, native iOS build, and all other executed jobs passed. The overall workflow reports a GitHub internal server error; GitHub rejected a retry. Required checks passed or were skipped. - [Codex review](https://github.com/block/buzz/pull/8150#issuecomment-6042500880) completed without major findings on the current head. - Mobile dependency setup, formatting, file-size checks, and analysis passed. - Full mobile suite: 3,039 tests passed, four skipped; all three unconfigured-push tests passed. - Widget regressions exercise real thread-page native parameters for channel/DM labels, renames, missing metadata, and disabled title interaction. - Native iOS 26.5 simulator check confirms the shared capsule renders “Thread” above “engineering,” with a single noninteractive accessibility header. Before/after captures use synthetic content. [Before/after simulator captures](https://github.com/block/buzz/pull/8150#issuecomment-6042451532) ### Post-merge validation During the mobile release baking period, open threads in channels and DMs on a device, including long channel names and larger text settings; verify the bubble stays clear of Back and has no tap action. Human app-test confirmation is not applicable under the standing Buzz mobile exception. buzz-review-completed Signed-off-by: Tom Brow <tomb@block.xyz>