fix(orderlist,picklist): enable generic type inference for items and slots

[YevheniiKotyrlo]

Defect Fixes

Fixes #8488

OrderList and PickList use any for their modelValue and slot scoped data. Unlike the Select family (#8484), these components' modelValue IS the full item array — there is no optionValue extraction. This means modelValue itself becomes T[] / T[][], providing end-to-end type safety from binding to slot.

Same root cause as #8442 — DefineComponent's no-arg constructor prevents generic inference. Same fix pattern as #8444 (DataTable/DatePicker).

Related: #7426, #6041

Reproducer: StackBlitz — bun run type-check (0 errors, typo undetected) → bun run patch && bun run type-check (TS2339 catches it)

Problem

<OrderList v-model="products">
  <template #option="{ option }">
    {{ option.naem }}
    <!-- No error — `option` is `any`, typo ships to production -->
  </template>
</OrderList>

After this fix, TypeScript infers T from the v-model binding and flows it to all slots:

<OrderList v-model="products">
  <template #option="{ option }">
    {{ option.naem }}
    <!-- TS2339: Property 'naem' does not exist on type 'Product' -->
  </template>
</OrderList>

Changes

• OrderListProps<T = any> — modelValue: T[], selection: T[]
• OrderListSlots<T = any> — item: T, option: T
• PickListProps<T = any> — modelValue: T[][], selection: T[][]
• PickListSlots<T = any> — item: T, option: T
• Both: generic constructor replaces DefineComponent

Why modelValue becomes T[] here

In Select/MultiSelect (#8484), modelValue stays any because optionValue extracts a scalar — the value type differs from the option type. OrderList and PickList have no optionValue extraction. The items in modelValue ARE the option objects, so modelValue: T[] is correct and gives full round-trip type safety.

What gets typed

Slot/Prop	Before	After
OrderList modelValue	any[]	T[]
OrderList selection	any[]	T[]
OrderList #option / #item data	any	T
PickList modelValue	any[][]	T[][]
PickList selection	any[][]	T[][]
PickList #option / #item data	any	T

Scope / Impact

• No breaking changes — backward compatible, T defaults to any
• No runtime changes — types only (.d.ts files)
• 2 components: OrderList, PickList

Verification

Gate	Result
pnpm run format:check	PASS
pnpm run lint	PASS
pnpm run test:unit	Pre-existing failures only, 0 new
pnpm run build:packages	PASS

Series

This is part of a series bringing generic type inference to all PrimeVue data components:

PR	Components	Status
#8444	DataTable, DatePicker	Open
#8484	Select, MultiSelect, Listbox	Open
#8485	Column (phantom of prop)	Open
#8489	AutoComplete, CascadeSelect, DataView	Open
#8490	Carousel, Galleria, Timeline	Open
#8491	OrderList, PickList	This PR
#8493	VirtualScroller, SelectButton, InputChips	Open

After this series, every PrimeVue component with a collection prop will infer T from the binding and flow it to slots — giving developers full IDE autocomplete and compile-time type safety in templates.