fix(autocomplete,cascadeselect,dataview): enable generic type inference for options and slots

[YevheniiKotyrlo]

Defect Fixes

Fixes #8486

AutoComplete, CascadeSelect, and DataView use any for their data arrays and slot scoped data. Developers get no type safety when working with suggestion and option slots.

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

<AutoComplete :suggestions="users" optionLabel="name">
  <template #option="{ option }">
    {{ option.naem }}
    <!-- No error — `option` is `any`, typo ships to production -->
  </template>
</AutoComplete>

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

<AutoComplete :suggestions="users" optionLabel="name">
  <template #option="{ option }">
    {{ option.naem }}
    <!-- TS2339: Property 'naem' does not exist on type 'User' -->
  </template>
</AutoComplete>

Changes

AutoComplete and CascadeSelect:

• [Component]Props<T = any> — suggestions/options: T[], callback params (data: T) => ...
• [Component]Slots<T = any> — option: T, suggestions/options: T[] in header/footer slots
• Generic constructor: new <T = any>(props: [Component]Props<T>) with $slots: [Component]Slots<T>
• modelValue stays any — when optionValue is set, the value is the extracted scalar, not the option object

DataView:

• DataViewProps<T> already exists with value: T[] — props were already generic from a previous PR
• DataViewSlots<T = unknown> — wires existing T to list and grid slot items: T[]
• Generic constructor replaces DefineComponent — completing the generic plumbing that was left half-done

What gets typed

Slot/Callback	Before	After
AutoComplete #option slot option	any	T
AutoComplete #header / #footer slot suggestions	any[]	T[]
AutoComplete optionLabel callback param	any	T
CascadeSelect #option slot option	any	T
CascadeSelect #header / #footer slot options	any[]	T[]
CascadeSelect optionLabel/optionValue/optionDisabled callback param	any	T
DataView #list / #grid slot items	any	T[]

Scope / Impact

• No breaking changes — backward compatible, T defaults to any
• No runtime changes — types only (.d.ts files)
• 3 components: AutoComplete, CascadeSelect, DataView

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	This PR
#8490	Carousel, Galleria, Timeline	Open
#8491	OrderList, PickList	Open
#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.