The local provider does not perform font metric optimization

[dungsil]

I'm not sure if this is intended, but it appears that the fonts available through the Local provider are not being optimised.

In the screenshot, Inter from google is displayed as ‘Fallback font: Inter’, but Pretendard from local is not.

[dungsil]

Reproduction link: https://github.com/dungsil/issues/tree/main/nuxt-fonts-171

[dosubot]

Hello, @dungsil! I'm here to assist you with any bugs, questions, or becoming a contributor. Let's tackle this together! 🤖

The local provider does not perform font metric optimization because the current implementation does not support reading font metrics. This is indicated by a TODO comment in the code:

// TODO: support reading font metrics

This means that while the local provider can register and resolve font files, it does not have the capability to optimize font metrics, which is why local fonts like Pretendard are not optimized. In contrast, fonts from Google, like Inter, are likely optimized because the Google provider includes font metric optimization ^[1][2].

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