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<!-- Draft PR body for #7387 · fix(mobile): preserve exact mention recipients in saved drafts · https://github.com/block/buzz/pull/7387 --> 🤖 ## Summary Saved drafts remembered their text but not exactly who each mention referred to: reopening a draft (or restarting the app) could re-bind a mention to the wrong same-name teammate, and a draft restored in one thread could capture text arriving for another. This PR saves the exact selected identities alongside the draft text and restores them together, so a reopened draft names the same recipients — with their agent markings — that you picked, including after a failed send. - Persists selected keys and agent presentation in the app's existing per-account/channel/thread draft storage (device-local; no cross-device portability claim). - Restores recipient bindings before text listeners run, including recovery from a rejected send; malformed legacy entries are ignored rather than guessed. - Retires the previous draft's listeners before restoring another, so switching threads can no longer write incoming text into your outgoing draft. ### Related issue - Fixes: N/A. No separate issue; the related work is the stack below. - Depends on #7385 (declared base) — same-name selections and qualified labels come from that PR. - 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 doesn't run on this stacked base (it reviews main-based ranges). ### Testing - Regressions cover two namesakes, restart, rename, rejected send, a second restart, and changing draft scope. - At `e544b247c32bdccf1b316d3329be247faf412f5f`: `just mobile-check` and full `just mobile-test` pass (2,085 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/7387#issuecomment-5574635970). - Verification is widget-test level; no native device or simulator run is claimed. To see it: mention an agent or a namesake, leave the channel, restart the app, and return — the draft still names the exact recipients you picked. ### Screenshots Flutter production-widget test renders — not native-device screenshots or acceptance captures. | Scenario | Before | After | |---|---|---| | Draft reopened after leaving the channel and restarting the app |  |  | <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 `39afd73b0adfde14164f4b10dbd089cb498312b6`. After: its head `8a781108507dc4501192b0101185decc1ed6f118`. </details> Signed-off-by: Logan Johnson <loganj@squareup.com>