feat(panel): alignment point tool in panel editor

[fixcik]

Refs #708 (эпик #705 — привязка рабочего нуля тремя методами). Фаза A: редактор панели.

Инструмент «точка центровки» по хэндоффу дизайнера:

• Кнопка crosshair в палитре (шорткат C), one-shot: клик ставит точку и возвращает select; ghost-крестик с превью снапа.
• Снап ≤ 2.5 мм к центру отверстия (tooling holes И отверстия дизайнов через кешированный drill-путь), точка наследует диаметр.
• Konva-слой пользовательских точек (info-синее кольцо с крестом, паттерн ToolingHoleLayer: hit-target, драг со снапом, Delete/Esc); реперные рисуются как раньше.
• Инспектор: секция «Точки центровки» — эффективные точки (реперные «авто» + пользовательские с удалением), бейджи «щупабельна · Ø N.N» / «только вручную», кнопка «+ Добавить точку».
• Баннер-подсказка активного инструмента через существующий ToolOptionsBar.
• Мутации shellStore с undo (recordUndo → savePanelConfig), id ap-N.
• Чистая логика в lib/alignmentPoints.ts (снап, порог щупабельности 2.0 — синхронизирован с Rust-константой, effective-зеркало effective_alignment_points()) + 12 vitest-тестов.
• i18n en/ru (project-неймспейс), паритет проверен.

Проверки: pnpm build (tsc + i18n-check) чисто, vitest 875 ok. Визуальная проверка инструмента в живом приложении — за пользователем.

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📥 Commits

Reviewing files that changed from the base of the PR and between 1383180 and af151d6.

📒 Files selected for processing (15)

• cuprum-ui/src/components/editor/canvasStyle.ts
• cuprum-ui/src/components/panel/AlignmentPointLayer.tsx
• cuprum-ui/src/components/panel/DraftShapes.tsx
• cuprum-ui/src/components/panel/PanelBlankCanvas.tsx
• cuprum-ui/src/components/panel/PanelToolPalette.tsx
• cuprum-ui/src/components/panel/ToolOptionsBar.tsx
• cuprum-ui/src/components/project/PanelEditor.tsx
• cuprum-ui/src/components/project/PanelInspector.tsx
• cuprum-ui/src/hooks/usePanelSnapHoles.ts
• cuprum-ui/src/lib/alignmentPoints.test.ts
• cuprum-ui/src/lib/alignmentPoints.ts
• cuprum-ui/src/locales/en/project.json
• cuprum-ui/src/locales/ru/project.json
• cuprum-ui/src/settingsStore.ts
• cuprum-ui/src/shellStore.ts

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