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…verhaul New engine features: - Auto row height: viewport-first sync measurement, idle async sweep, manual-always-wins priority, scroll compensation - Column stretch: 'all'/'last' modes, ResizeObserver, frozen column handling - Text wrapping: word-boundary + char fallback, multi-line canvas rendering - Date picker: calendar overlay, keyboard nav, ARIA dialog, scroll-aware - DateTime editor: calendar + hour/minute spinners, ISO commit format - Context menu submenus: recursive nesting, hover delays, keyboard nav - Locale system: EN/RU packs, runtime switching, resolveLocale() merge - Cell editor registry: priority-sorted resolution, CellEditor lifecycle - Benchmark suite: BenchmarkRunner with 6 metrics across 1K/10K/100K rows Documentation overhaul: - Internal: ARCHITECTURE.md (all engine subsystems), TESTING-GUIDE.md, DOCUMENTATION-STYLE-GUIDE.md, CHECKLIST.md, CLAUDE.md - Site audit: 47 existing pages verified against source code, 80+ factual errors fixed (wrong signatures, fabricated payloads, incorrect types, outdated class names) - 6 new guide pages: auto-row-height, text-wrapping, column-stretch, date-editors, cell-editor-registry, locale - Cross-references: features index, editing, configuration, cell-types - Context menu submenus section with positioning, timing, keyboard nav - Site: 48 → 54 pages, 0 build errors Demo: sidebar layout, feature toggles, badges, 1K/1M row toggle Tests: 1708 unit tests, 13 E2E Playwright tests
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Auto row height, column stretch, date picker, context menu submenus, locale, cell editor registry, datetime editor.
Changes
Benchmark suite: BenchmarkRunner, measureMultiRun, computeStats, measureThroughput — 6 metrics across 1K/10K/100K datasets.
Text measurement + word-wrap: TextMeasureCache extended with getWrappedLines (word-boundary + char fallback), measureWrappedHeight. ColumnDef.wrapText option. CellTextLayer renders multi-line wrapped text.
Auto row height: RowStore auto/manual separation (manual wins). LayoutEngine.setRowHeightsBatch() for O(n) batch. AutoRowSizeManager: viewport-first sync + requestIdleCallback async sweep. Dirty tracking, scroll compensation.
Column stretch: ColumnStretchManager with 'all' and 'last' modes. ResizeObserver. Manual resize exclusion, frozen column handling.
Date picker: DatePickerOverlay — pure-DOM calendar, keyboard nav, ARIA role=dialog.
Context menu submenus: ContextMenuItem.submenu for recursive nesting. Chevron, hover delay, keyboard nav. Empty menu prevention.
Locale system: EN/RU packs, resolveLocale(), runtime switching.
Cell editor registry: CellEditor interface, CellEditorRegistry with priority resolution. DatePickerEditor adapter. InlineEditor fallback.
DateTimeEditor: Calendar + hour/minute spin controls for 'datetime' columns. ISO YYYY-MM-DDTHH:mm commit. Tab cycling, Now button.
Demo overhaul: Sidebar layout, all features demonstrated, 1K default / 1M toggle.
Tests