feat(drill): shared Z bar in fiducial centering (safe-descent mode)

[fixcik]

Фоллоу-ап к #662 (эпик #656). Z-управление в панели центровки теперь — наш стандартный бар DrillManualZBar (как везде), вместо самодельных Z−/Z+ кнопок.

Бар обобщён безопасным режимом (safeDescent), т.к. его обычные взаимодействия опасны для спуска без привязанного Z-нуля:

• клик по треку ВНИЗ — игнорируется (isSafeDescentTarget), вверх — ок;
• Z± — только клик-шаг (без continuous/hold);
• инлайн-редактор ридаута отключён (нет прыжка Z в произвольную точку);
• шаги заперты [0.05/0.1/0.5], спуск Z− на медленной подаче 60 мм/мин, подъём — обычной;
• клэмп к машинному Z-envelope.
  Тул-ченджевый бар (без пропа safeDescent) — без изменений. Кнопка «безоп. Z» (rapid-ретракт) оставлена рядом.

Фрейм-фикс #692 в панели (навод jogTo(ideal), envelope вокруг ideal+WCO, баннер «выставьте рабочий ноль», гейт homed) — не затронут.

Плюс правка docs/PROJECT.md: формулировка центровки «машинные позиции/machine-координата» → work(G54) (убираю тот же неверный ярлык, что породил #688).

821 фронт-тест зелёные (+4 на isSafeDescentTarget), i18n паритет en/ru.

Refs #662

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 0379fbbd-0ce4-491e-bcc1-22a4efcbe7b9

📥 Commits

Reviewing files that changed from the base of the PR and between 5c6c804 and 6fc643b.

📒 Files selected for processing (7)

• cuprum-ui/src/components/drill/DrillManualZBar.tsx
• cuprum-ui/src/components/drill/FiducialPanel.tsx
• cuprum-ui/src/lib/zbar.test.ts
• cuprum-ui/src/lib/zbar.ts
• cuprum-ui/src/locales/en/drill.json
• cuprum-ui/src/locales/ru/drill.json
• docs/PROJECT.md

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