Enforce valid order sizing in manual entry

[luokerenx4]

Summary

• make Quantity and Cash Qty mutually exclusive in the manual order form
• clear Quantity when notional sizing is entered, and clear Cash Qty when share/contract sizing becomes authoritative
• expose Cash Qty only for Market orders and remove it when switching to Limit
• build the request defensively so it can never carry both sizing fields
• add component coverage for both sizing directions and the Market-to-Limit transition

Root cause

The form claimed Cash Qty would override Quantity, but retained both values and sent both fields. UTA explicitly rejects totalQuantity + cashQty as mutually exclusive. The form also allowed a Limit order to use Cash Qty even though UTA supports notional sizing only for Market orders.

Verification

• pnpm vitest run ui/src/components/uta/OrderEntryDialog.spec.tsx
• npx tsc --noEmit
• cd ui && npx tsc -b
• pnpm test (358 passed, 1 skipped; 3391 tests passed, 9 skipped)
• git diff --check
• Demo browser walkthrough on Alpaca Paper: reproduced Quantity 1 + Cash Qty 100 with submit enabled before the fix; after the fix, entering Cash Qty clears Quantity, and switching to Limit removes Cash Qty and disables submit until valid Limit sizing is supplied

Boundary touch

• trading UI validation only; no UTA, broker adapter, account state, or order execution code changed
• live-paper execution was not required because the change prevents a request that UTA already rejects before any broker write

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Project	Deployment	Actions	Updated (UTC)
openalice-demo	Ready	Preview, Comment	Jul 28, 2026 10:02pm