chore(js-client): improve types

[maoberlehner]

Fixes WDX-188

[Copilot]

Pull Request Overview

This PR enhances type safety in the js-client package by adding explicit type annotations to previously untyped variables, addressing WDX-188.

Key Changes:

• Added explicit type annotations to array and nullable variables
• Improved type safety for timeout handling with additional null check

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/js-client/src/utils.ts	Added string array type annotation to pairs variable
packages/js-client/src/sbFetch.ts	Added type annotations for body and timeout variables, plus null safety check for timeout

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commit: d8ba7b7