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<!-- Draft PR body for #7385 · fix(mobile): bind same-name mentions to exact selected identities · https://github.com/block/buzz/pull/7385 --> 🤖 ## Summary If two people in a channel share a display name, mobile couldn't tell them apart in mentions: picking the second could overwrite the first's selection, a rendered mention linked whichever same-name person matched first, and a later rename or a shorter name could re-bind the text to the wrong recipient. This PR binds every mention to the exact selected identity: - Each same-name selection keeps its own recipient instead of overwriting by name; conflicting picks get a qualified label like `Name (key…)`. - The longest matching label wins, so a shorter or interior name can never claim part of a longer one and steal its identity. - Rendering resolves recipients by the signed identity key from the event's tags — never from message text alone — so qualified labels stay correct regardless of tag order and survive later renames; an untagged ambiguous label blocks shorter mentions instead of silently re-binding. Ports the landed Desktop exact-recipient behavior (see `docs/mention-editor.md`). ### Related issue - Fixes: N/A. No mobile issue; Desktop's landed exact-recipient fixes are the reference this ports. - Independent base (`main`). #7387 (child) persists these exact selections in saved drafts. - Landing note: branches in this series overlap in the composer — when rebasing, keep exact/durable mention bindings, the explicit invite/reference-only choice, the account/visit/revision fences, and authorization before membership preparation and publication; don't resolve conflicts by taking either side wholesale. - Draft — not requesting merge yet; the security advisory run for this range timed out without results (no verdict). ### Testing - Regressions cover same-name collisions, prefix/overlap, removal, tag order, and renames. - At `acd841354a692243f1cb4c04059baad42f1d2abb`: `just mobile-check` and full `just mobile-test` pass (2,082 tests). The earlier full `just ci` receipt linked below is reused only for unchanged non-mobile code/tooling, not claimed as a rerun at this head. - Previous-head evidence: `just mobile-check`, the full mobile test suite, and full local `just ci` all pass — receipts in the [exact-head evidence comment](https://github.com/block/buzz/pull/7385#issuecomment-5574635836). - Verification is widget-test level; no native device or simulator run is claimed. To see it: mention two teammates with the same display name — both stay distinct, the second shows a qualified label, and the rendered message keeps both correct even after either renames. ### Screenshots Flutter production-widget test renders — not native-device screenshots or acceptance captures. | Scenario | Before | After | |---|---|---| | Qualified mention chip for same-name recipients, at 200% text scale (deliberate stress fixture) |  |  | <details> <summary>Capture provenance</summary> Rendered by the Flutter widget engine in a `flutter test` run (production widgets, production theme; no device or simulator). Before: this PR's declared base `3c7f288c60d67df78577b237e27c3dfc8831aaa1`. After: its head `39afd73b0adfde14164f4b10dbd089cb498312b6`. </details> Signed-off-by: Logan Johnson <loganj@squareup.com>