fix: add default font weight for local system fonts if not found

[riccardoperra]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/riccardoperra/codeimage/blob/main/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[codesandbox]

Review or Edit in CodeSandbox

Open the branch in Web Editor • VS Code • Insiders

Open Preview

[changeset-bot]

🦋 Changeset detected

Latest commit: 5a8f414

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@codeimage/app	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

Deploy preview for codeimage-highlight-dev ready!

✅ Preview
https://codeimage-highlight-lkv3ejfoa-riccardoperra.vercel.app
https://codeimage-highlight-pr-604.vercel.app

Built with commit 5a8f414.
This pull request is being automatically deployed with vercel-action

[github-actions]

Deploy preview for codeimage ready!

✅ Preview
https://codeimage-6u6xnmxh6-riccardoperra.vercel.app
https://codeimage-app-pr-604.vercel.app

Built with commit 5a8f414.
This pull request is being automatically deployed with vercel-action