- safe-markdown: add `cancelled` flag to async useEffect; no more setState after unmount when component is destroyed mid-import - rich-editor: same cleanup for preview tab effect; also remove dead `prose prose-sm max-w-none` classes (Tailwind Typography not installed) and replace with explicit arbitrary-selector markdown styling that actually renders using existing design tokens - profile-certificate-slot: drop dead `ORDER_LABEL`, `order` variable, and `physicalOrder` from `MineCertificateResponse`; physical orders are disabled — these were leftover references causing lint noise - learning-panel: change `issuingCert: boolean` → `issuingCertFor: number | null` so only the targeted user's button shows a spinner; a boolean shared across all users caused the wrong row to animate when the admin switched selected users mid-request Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>