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## Summary Selecting two people or agents named Scout could replace the first recipient with the second even though the message still looked right. This binds each selection to its exact identity: the first keeps `@Scout`, and a conflicting selection gets `@Scout (<full public key>)`. Removing one no longer removes or redirects the other. - Reuse the existing **@ suggestion list**; team selection and automatic agent addressing reserve and reuse distinct labels too. Typing an ambiguous name manually shows an instruction to use the picker and preserves the draft without publishing—in chat, edits and standalone forums. - Share literal mention matching across recipient extraction, removal, display and editing so a shorter name cannot claim another recipient's longer or qualified label. - Rebuild authored references when a message is edited, and use the latest authorized snapshot when reopening or forwarding. Rendering/editing can recover qualified identities only from the message's recorded references, not from a key typed into its body. Unresolvable historical names remain literal rather than guessed recipients. - Wrap full-key labels within narrow/zoomed layouts while keeping their complete accessible label and ordinary mention icons. Edit activation waits for the action menu's focus cleanup before focusing the editor. ### Related issue Targets `main`; mention spacing (#7128) is already merged. Split from #7114. This is independent of the #7124 → #7125 remote-invitation stack and does not expand agent eligibility or invitation permissions. The separate Enter-selection suffix issue remains tracked in #7253. ### Testing The desktop unit suite and focused mock-Chromium checks passed on the published integration candidate, including pending-paste selection, edit/forwarding, copy and narrow-layout cases; formatting, types and frontend builds passed. On `0b3b18c0`, 64 focused trust/paste/selection unit tests and six mock-Chromium tests passed with zero browser retries, including actual timeline chip copy → fresh channel paste → send and mismatched-key rejection; TypeScript, changed-file Biome and an isolated E2E build passed. The broader browser run had copy failures before the focused repairs and is not claimed as wholly green. See [live CI](https://github.com/block/buzz/pull/7133/checks) for current-head results. No full local `just ci` pass, native/live-relay or cross-browser validation is claimed. To try it: select two same-name recipients, remove one, send, then edit/reopen and forward; only the intended identities should remain. Type an ambiguous name without choosing a suggestion and check that sending retains the draft with an error. Inspect full-key labels in a narrow window at 150% text size, and open Edit and type immediately.   *Earlier mock-browser captures, not current-head runtime proof. No new before-state capture; screenshots alone do not prove recipient delivery.* **Clipboard trust:** generated full-key-qualified mentions now retain their exact recipient after copy/paste when the full key matches the clipboard record and community directory/profile state independently vouches for the base alias, including numeric collision suffixes. A qualifier alone does not establish trust. Arbitrary historical labels still cannot always be reconstructed. --------- Signed-off-by: Logan Johnson <loganj@squareup.com> Co-authored-by: Larry <627498bd4bd1f281a16431e3c6cce3b5c25b6692798c78672298aefbf2f8f8b5@buzz.block.builderlab.xyz> Co-authored-by: Bad Janet <150b20bdf6130418df9239dd1bd082c71612c8d653b47c277200365b9be215dc@buzz>