BridgeJS: Add JSTypedArray convenience typealiases as recognized types

[krodak]

Overview

Add JSTypedArray<T> as a recognized BridgeJS type, so users can use typed arrays directly in @JS function signatures. Both the generic form and convenience typealiases are supported:

// Generic form
@JSfunc processData(_ data:JSTypedArray<UInt8>)->JSTypedArray<UInt8>{...}
// Convenience typealias (equivalent)
@JSfunc processData(_ data:JSUint8Array)->JSUint8Array{...}

Both generate identical TypeScript:

processData(data: Uint8Array): Uint8Array;

Bridging is reference-based — passes the JSObject ID across the boundary with no data copying. The TypedArray lives on the JS heap.

This complements the separate numeric array optimization PR (#8) which makes [Int]/[Double] faster internally while keeping number[] in TypeScript. This PR gives users the option to use actual TypedArray types when they need them (e.g., for fetch body, WebGPU).

What changed

• JSTypedArray.swift — 8 convenience typealiases: JSInt8Array, JSUint8Array, JSInt16Array, JSUint16Array, JSInt32Array, JSUint32Array, JSFloat32Array, JSFloat64Array
• SwiftToSkeleton.swift — Pre-seed typed array types in the type resolver (same pattern as JSPromise). Recognize JSTypedArray<T> generic form and map to the corresponding typealias.
• BridgeJSLink.swift — Map Swift typealias names to JS TypedArray constructor names in tsType (e.g., JSUint8Array → Uint8Array)
• TS2Swift/processor.js — Map TypeScript TypedArray types to Swift typealias names in the TS importer (e.g., Uint8Array → JSUint8Array), preventing import of full TypedArray API surface
• Snapshot tests — JSTypedArrayTypes.swift test input covering both typealias and generic forms
• E2e runtime tests — JSTypedArrayTests.swift + JSTypedArrayTests.mjs with round-trip tests for Uint8Array, Float32Array, Float64Array, Int32Array (both Swift→JS and JS→Swift directions, including empty arrays)

Type mapping

Swift	TypeScript
JSTypedArray<Int8> / JSInt8Array	Int8Array
JSTypedArray<UInt8> / JSUint8Array	Uint8Array
JSTypedArray<Int16> / JSInt16Array	Int16Array
JSTypedArray<UInt16> / JSUint16Array	Uint16Array
JSTypedArray<Int32> / JSInt32Array	Int32Array
JSTypedArray<UInt32> / JSUint32Array	Uint32Array
JSTypedArray<Float> / JSFloat32Array	Float32Array
JSTypedArray<Double> / JSFloat64Array	Float64Array

Test coverage

• 134 snapshot tests pass
• 170 XCTest + 11 swift-testing e2e tests pass
• Round-trip verified for all 4 TypedArray types from both Swift and JS sides

[krodak]

Tracked in new PR against main repo