feat(grid): spreadsheet-style line-item editor (computed cells, ghost row, keyboard nav)

[xuyushun441-sys]

Why

Even the invoice line grid felt poor: Amount was a manual field, the running total stayed 0, columns were mis-sized, you had to click "Add line" repeatedly, and a redundant per-row "expand" sat on every thin line. This rebuilds GridField's editable grid mode into a real enterprise line-item editor — the QuickBooks / Stripe / NetSuite pattern — generalised so every inline grid benefits, not just invoices.

What

• Computed read-only columns. A child field carrying an arithmetic expression (e.g. amount = quantity × unit_price) renders read-only, recomputes live as its inputs change, and writes the result back into the row so it persists and the running total reflects it. A tiny safe arithmetic evaluator (no eval/Function) over + - * / %, parens and record.<field> refs powers it.
• Trailing "ghost" row — start-with-one + auto-append. Typing in the ghost materialises a real row (index-stable keys, so focus/caret survive); you keep entering lines without clicking "Add".
• Borderless click-to-focus cells + role-based column widths (description flexes; qty/price/amount stay narrow) — reads as a table, not a wall of boxes.
• Keyboard nav — Enter / ArrowUp / ArrowDown move between rows in the same column; Tab falls through into the ghost row.
• Gated per-row expand — shown in form mode (it is the editor) and in grid mode only when the grid omits fields. No redundant expand on a thin invoice line.
• deriveColumns surfaces a field expression as a computed column; the running-total column now prefers the computed/last-currency column over the first numeric. Blank/ghost rows are filtered from the persisted batch (isBlankRow) so an untouched line never saves as an empty child.

Verification

• Unit: 56 passing across GridField, deriveMasterDetail, masterDetailTx (computed mapping, ghost auto-append, keyboard nav, blank-row filtering).
• Live e2e (9 passing): New Invoice grid computes amount live (2 × 50 → 100), persists it, rolls up the total, and skips the blank ghost line.
• Browser-verified the redesigned grid (computed Amount, ghost row, correct Total, no redundant expand).

Dropped row-expand.spec — its "grid-mode expand on a thin line" scenario is intentionally gone; per-row form editing stays covered by the form-mode master-detail spec.

Depends on framework#1638 (the invoice line amount expression). The live backend already serves it.

🤖 Generated with Claude Code

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
objectui	Ignored		Jun 7, 2026 7:42am

[github-actions]

✅ Console Performance Budget

Metric	Value	Budget
Main entry (gzip)	267.3 KB	350 KB
Entry file	index-CVqQ8DAy.js	—
Status	PASS	—

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📦 Bundle Size Report

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Size Limits

• ✅ Core packages should be < 50KB gzipped
• ✅ Component packages should be < 100KB gzipped
• ⚠️ Plugin packages should be < 150KB gzipped