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## problem When a message mentions two different identities that share a display name, the mobile composer qualified only the later selection as `@Name (<64-hex>)` and left the first one bare. A qualified occurrence denies the plain name on render, so the first mention rendered as plain text on mobile and desktop. `MessageContent` also displayed every mention in the lowercased binding key rather than its authored spelling. ## change - `mention_bindings.dart`: - `selectedMentionLabel` qualifies a selection whenever another selected identity shares its name, without regard to case. - `namesakeRequalifications` and `renameMentions` qualify earlier plain selections. Each occurrence keeps its authored spelling, and occurrences in code stay as typed. - `compose_bar/helpers.dart` and `compose_bar_widget.dart`: - Selecting a namesake qualifies earlier same-name mentions before the new label is inserted, keeping the caret in place. - Occurrences inside code that the composer styles are skipped: single-backtick spans and closed triple-backtick fences, found by the same walk the editor uses to draw them. A key whose occurrence stays in code remains bound beside its qualified label, so its recipient still sends. - `agent_mention_prefill.dart`: automatic addressing qualifies every same-name agent it inserts. - `message_content.dart`: mentions render in their authored spelling, and bindings still resolve case-insensitively. - `docs/mention-editor.md`: describes the behavior, including that Markdown code forms the composer does not style (tilde fences, indented code) are qualified like prose. ## tests - `mention_bindings_test.dart`: requalification, spelling preservation and code exclusion. - Composer journeys: - picker selections qualify both namesakes and send both keys; - styled code (fences, list fences, spans, spans after bold or italics) stays as typed while surrounding prose is qualified; - a selection left only in code keeps its recipient; - automatic prefill of two same-name agents qualifies both. - `message_content_exact_mentions_test.dart`: authored casing with case-insensitive resolution. - `just mobile-check mobile-test` passes. - Real relay: composed bodies exchanged through a local relay render as correctly targeted chips in desktop and in Flutter `MessageContent`. --------- Signed-off-by: Kalvin Chau <kalvin@block.xyz> Signed-off-by: Tom Brow <tomb@squareup.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: goose-wayne <ae6b377e5b6d090ee22558d19246413a5731628a127e25371111badfd4861535@buzz.block.builderlab.xyz> Co-authored-by: Tom Brow <tomb@squareup.com> Co-authored-by: peon <9ac6794b000690b7e814eb1805ad32405d0bec7d52838de3a86cf967565dacc0@buzz.block.builderlab.xyz>