Note

Medium Risk
Touches order placement/calc flows and adds controller-backed cancel actions; main risk is incorrect filtering/validation leading to missing orders or blocked/incorrect submissions, but changes are UI-scoped and covered with new component/tests.

Overview
Adds limit-order UX to perps order entry by introducing a LimitPriceInput (direction-aware bid/ask/mid and +/- presets, formatting/validation) and wiring it through OrderEntry/usePerpsOrderForm so calculations and submissions use the limit price when provided.

Extends open-orders surfaces to show only resting user limit orders (filtering out TP/SL and reduce-only/trigger orders) and adds cancellation controls: per-order cancel buttons on OrderCard plus a “Cancel All Orders” action in the perps tab, both calling getPerpsController().cancelOrder/cancelOrders. The market detail page also subscribes to top-of-book data for presets, disables submit when limit price is invalid, and returns immediately after placing limit orders (no position-pending wait).

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