BridgeJS: Add UInt support

[krodak]

Introduction

Adds UInt type support to BridgeJS, allowing Swift functions using UInt parameters and return values to be exported to JavaScript.

Motivation: Enable developers to use existing Swift code with UInt types without requiring modifications to use Int instead.

Example

@JS func processUnsigned(_ value: UInt) -> UInt {
    return value * 2
}

TypeScript:

export function processUnsigned(value: number): number;

Implementation Notes

• UInt maps to number in TypeScript (same as Int)
• Uses bitwise conversion to preserve the full UInt32 range (0 to 4,294,967,295)
• On the JS side, return values use >>> 0 to convert signed Int32 back to unsigned

This approach is consistent with how Int supports its full range (-2^31 to 2^31-1) — UInt also supports its full range. But if we'd rather just not handle this case and return .identity, just let me know.

Testing

• Added UInt to primitive type snapshot tests
• Added E2E round-trip tests including edge case 4294967295 (max UInt32)