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Marc-André BombeckandClaude Opus 4.7
9413d29303
The v1.4.20 implementation reset the composer by mounting the
`<CoachDrawer>` with `key={prefill}`. That weaponised React's
key-reset to flush internal state every prefill change — Sr-HIGH-4
flagged it as a smell because the next refactor that touches the
drawer's mount point silently loses the reset semantics.
Replace with the controlled-prop pattern React documents at
https://react.dev/learn/you-might-not-need-an-effect#adjusting-some-state-when-a-prop-changes:
new `useResettableValue` hook reads the controlled prefill, mirrors
it via a sibling useState pair, and seeds the composer with the new
value when the prop changes. Render-phase setState — ESLint-clean
against `react-hooks/set-state-in-effect`. The user can still type
freely; the drawer only resets when the parent changes which
suggested-prompt chip is active.
`nextResettableValue` exposes the comparison contract as a pure
helper so the unit test can pin the (Object.is) semantics without
standing up a React renderer.
The `<CoachDrawer key={…}>` is gone from the insights page mount.
Tests +5: pure-function coverage of unchanged value (no reset),
prefill change (reset), null↔empty transition (reset), suggestion
chip → cleared prefill (reset), and NaN-to-NaN edge case (no reset
under Object.is).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>