fix: Fix regex issue Update rollup.config.ts

[ursulabauer]

Description

I noticed a bug in the regex used for transforming package names. The current code attempts to access x[1] in the replacement function, which can be undefined if x is a single character (like - or /). This causes the script to fail.

I’ve fixed it by using x.slice(1) instead, which safely handles single-character cases. Here's the corrected line:

const name = pkg.name.split("/")[1].replace(/[-/]./g, (x: string) => x.slice(1).toUpperCase())  

This change ensures the script works as expected without errors.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have run yarn style without getting any errors
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[cedoor]

Hi @ursulabauer, package names in this repo should always follow the following format: @zk-kit/<package-name>. So it's fine if that script fails, as it means that the name is not supported.