fix: add font-synthesis for italic & bold in fonts that don't have them specified #2325

[nperez0111]

Summary

This adds support for italic & bold in fonts that do not already have them specified. See this for more info: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/font-synthesis

Rationale

Changes

Impact

Testing

Screenshots/Video

Checklist

• Code follows the project's coding standards.
• Unit tests covering the new feature have been added.
• All existing tests pass.
• The documentation has been updated to reflect the new feature

Additional Notes

fixes #2325

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Project	Deployment	Review	Updated (UTC)
blocknote	Ready	Preview	Jan 14, 2026 1:58pm
blocknote-website	Ready	Preview	Jan 14, 2026 1:58pm

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commit: bef978b