[splincode]

Summary

• expand all 18 full answers in the Microcopy и коммуникация интерфейса subsection
• cover actionable button and CTA labels, error/retry flows, destructive operations and progressive disclosure
• explain safe backend error mapping, unknown-operation states, security concerns with account enumeration, and localization
• add product trade-offs for conversion experiments, ethical upsell and dark patterns
• clarify shared ownership of UI text between frontend, product, design and support

Each expanded answer adds mechanisms, examples, caveats and practical interview guidance while keeping the short answers compact.

Scope

• continues Расширить полные ответы во всех разделах #49
• changes only src/pages/ui-ux/index.md
• completes the Microcopy и коммуникация интерфейса subsection
• UX-метрики и проверка решений and later UI/UX subsections are out of scope

Verification

CI should validate:

• npm run format:check
• npm run build

Part of #49.