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Mobile showed Markdown backslash escapes literally. A message linking a channel as `[\#buzz-mobile](buzz://channel/…)` rendered as `\#buzz-mobile`, and `\[text\]` rendered as LaTeX math. gpt_markdown has no backslash escapes. Outside code, each escaped ASCII punctuation character is now held as a stand-in (an invisible word joiner plus the character's fullwidth form) before parsing, so no other syntax (links, emphasis, mentions, channel tokens, math) matches it. A new inline component and the link and image builders restore the original character. The inbox/search preview builder already handled escapes this way; its helpers moved to a shared `markdown_escapes.dart`. Two edge cases found in review are covered: shielding runs after trailing-gallery extraction so carousel URLs and labels stay as authored, and a bare link no longer takes a trailing backslash into its destination. Codex review added: escaped backticks stay literal instead of opening code, authored word joiners are not mistaken for stand-ins, Buzz URL punctuation peeling keeps a trailing backslash, gallery semantic labels drop escapes, the trailing-backslash peel is linear and reruns after delimiter stripping, an escaped `\<url>` is not treated as an autolink, `~~~` fences are skipped like backtick fences, an autolink containing `\` keeps it in both label and destination, and the stand-ins use fullwidth characters so the one gpt_markdown fallback that shows raw text (multi-line strikethrough) still reads right. Later review: fence detection looks back only over blanks and `>` markers, so it stays linear on long lines (security review) and treats an unclosed fence inside a quote or list as code, like the renderer (Carl). Behavior change: `\(x\)` and `\[x\]` now show as `(x)` and `[x]` instead of math, per CommonMark. Desktop (buzz-app) doesn't render math either. `$…$` math is unchanged. ### Validation - Added tests: a `MessageContent` table covering escapes in prose, bold, link labels (HTTP and `buzz://channel`), fenced and inline code (left literal), a bare link ending in `\`, and escaped backticks, authored word joiners and fullwidth characters, a `~~~` fence, a multi-line strikethrough, `<https://example.com/a\>`, a Buzz URL ending in `.\`, an emphasized bare URL ending in `\*`, an escaped `\<url>`, and a trailing image gallery with escaped labels (including its semantics label), in plain and bubble layouts. Each row also asserts no stand-in reaches visible text or semantics. Reverting any one of these fixes fails it. - `flutter analyze` is clean and the full mobile suite passes, except for 11 `notification_toggle_test.dart` tests. Those fail locally on the Studio at the CI-greena3964abas well, so they are environmental and unrelated to this change. A 256 KiB regression test covers the linear fence scan, and it fails on the earlier code. - iPhone 17 Pro simulator (iOS 27) signed in to the internal community: loganj's original message now shows `#buzz-github-prs` and `#buzz-mobile`. - Full-app run on [a3964ab](a3964ab08c): debug build on a fresh iPhone 17 Pro simulator (iOS 27), signed in to the internal community with live data. Covered the #buzz-github-prs timeline (long linked lists, bare URLs, mentions, reactions, thread summaries), a thread view, Inbox previews (the shared preview helpers), a DM with a bare link and a channel link, and search results. Everything rendered as before apart from the fixed escapes, with no stray stand-in characters. Limitations: debug build, iOS only, no gallery or code-block messages were in the visited history (the widget tests cover those), and a 165-second recording was taken but GitHub can't take it through our upload script. Two quirks seen are pre-existing and unchanged here: a bare link absorbs a trailing comma, and search shows raw Markdown for messages over 512 characters. <details><summary>Full-app screenshots</summary> | Channel | Channel (scrolled) | Thread | | --- | --- | --- | |  |  |  | | **Inbox** | **DM** | **Search** | |  |  |  | </details> ### Before / after Before (production build, reported):  After (this branch, same message):  🤖 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> Co-authored-by: studio <dc2fc481343672df31a689840c09299972e704dac592e0da6f18486646a7ee3e@buzz.block.builderlab.xyz> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
