chore: upgrading vitest to 4.0.18

[jaredwray]

Please check if the PR fulfills these requirements

• Followed the Contributing and Code of Conduct guidelines.
• Tests for the changes have been added (for bug fixes/features) with 100% code coverage.

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
chore: upgrading vitest to 4.0.18

[gemini-code-assist]

Summary of Changes

Hello @jaredwray, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on a routine maintenance task: updating various development dependencies to their latest stable versions. The core update is for the Vitest testing framework, which brings its ecosystem of related packages up to date. Additionally, other crucial build and development tools like Biome, esbuild, Rollup, and Vite have received updates. These changes aim to incorporate the latest bug fixes, performance enhancements, and features from these tools, contributing to a more robust and efficient development environment.

Highlights

• Vitest Upgrade: The primary change involves upgrading the testing framework vitest from version 4.0.15 to 4.0.18, along with its associated packages like @vitest/coverage-v8, @vitest/expect, and others.
• Development Dependency Updates: Several other development dependencies have been updated to their latest patch or minor versions, including @biomejs/biome (from 2.3.8 to 2.3.13), esbuild (from 0.25.12 to 0.27.2), rollup (from 4.53.3 to 4.57.0), chai (from 6.2.1 to 6.2.2), expect-type (from 1.2.2 to 1.3.0), and vite (from 7.2.6 to 7.3.1). These updates also include numerous platform-specific packages for esbuild and rollup.
• Lockfile Synchronization: The pnpm-lock.yaml file has been extensively updated to reflect the new versions and their transitive dependencies, ensuring consistency across installations.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b6788b3) to head (803d730).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #125   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          281       281           
  Branches        65        65           
=========================================
  Hits           281       281           

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[gemini-code-assist]

Code Review

This pull request upgrades vitest and @biomejs/biome along with their transitive dependencies. The changes are straightforward version bumps for development dependencies. The updates are patch releases, which are generally safe and contain bug fixes. The changes in package.json and the corresponding updates in pnpm-lock.yaml look correct. This is a good maintenance update.