feat(crash): frontend error capture (ErrorBoundary + global handlers)

[fixcik]

Фаза 2 локального crash-reporting (Refs #687). Захват ошибок фронта → Rust-команда report_frontend_crash из Фазы 1.

Что внутри

• ErrorBoundary (components/ErrorBoundary.tsx) — ловит ошибки рендера React, показывает fallback с кнопкой перезагрузки.
• Глобальные хендлеры в main.tsx — window.onerror и onunhandledrejection.
• breadcrumb — api.ts запоминает имя последнего invoke(...), кладётся в отчёт как «последняя операция».
• reportCrashSafe — общий guard-репортер: re-entrancy-флаг рвёт потенциальную петлю (реджект report_frontend_crash → unhandledrejection → снова репорт), и console.error first — ошибка видна даже если запись в бэк упала.
• Биндинги домена api.crash (listPending/reportFrontend/markReported/dismiss/buildReport).

Проверки

pnpm build (tsc + vite + i18n-check) — зелёно; pnpm test — 816/816.

Ревью

spec ✅ · code-quality (нашло и починило Critical: петлю репортинга) ✅ · финальное независимое ✅.

Дальше

Фаза 3 — UX отправки: старт-промпт о неотправленном креше, пункт меню «Сообщить о проблеме», tauri-plugin-opener, i18n namespace crash (заменит временные литералы в ErrorBoundary).

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Reviewing files that changed from the base of the PR and between ee50ee2 and 2bba4fd.

📒 Files selected for processing (3)

• cuprum-ui/src/components/ErrorBoundary.tsx
• cuprum-ui/src/lib/api.ts
• cuprum-ui/src/main.tsx

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