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Mobile renders `#channel` tokens as chips, but a token followed by an apostrophe, quote, ellipsis or dash stayed plain text: `#general's`, `"#general"`, `#general…` and `#general—` all lost their chip because the token only ended at whitespace or `, ; . ! ? : ) ] }`. This ends channel tokens at those characters too (`' " ‘ ’ “ ” » … – —`). The message body and the one-line preview each had their own copy of the channel regex; they now share one `channelTokenPattern`, so they can't drift apart again. `@mention` boundaries are unchanged on purpose: on mobile and desktop the same boundary also decides which mentions are bound and tagged when sending, so changing it is a separate, cross-surface decision. ### Validation Added tests: - Preview table covering each new trailing character (and matching opening quotes). - Message body: `#general's` keeps the chip and renders the `'s` suffix. Both fail with the previous boundary. The full mobile test suite passed in pre-push. Simulator render on an iPhone 18 Pro (iOS 27): real message-body and preview widgets with channels `general` and `eng` loaded, rendered with both stacked PRs applied. | Before (`main`) | After ([#8860](https://github.com/block/buzz/pull/8860) + [#8862](https://github.com/block/buzz/pull/8862)) | | --- | --- | | <img src="https://raw.githubusercontent.com/block/buzz/5afead6a162d5c8554ad17175fc2dccff93bf2af/pr-8862--01-before-main.png" width="300"> | <img src="https://raw.githubusercontent.com/block/buzz/5afead6a162d5c8554ad17175fc2dccff93bf2af/pr-8862--02-after-both-prs.png" width="300"> | Human app test: not applicable under the mobile-client testing exception; agent review and simulator validation above. buzz-review-completed 🤖 Generated with [Claude Code](https://claude.com/claude-code) Signed-off-by: Tom Brow <tomb@squareup.com> Co-authored-by: Tom Brow <tomb@squareup.com>
