feat: update font in layout component

[pasqualevitiello]

What does this PR do?

• Fixes #XXXX (GitHub issue number)
• Fixes CAL-XXXX (Linear issue number - should be visible at the bottom of the GitHub issue description)

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• [ ] I confirm automated tests are in place that prove my fix is effective or that my feature works.

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• I haven't read the contributing guide
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---

Summary by cubic

Switched the app’s base sans font to the self-hosted CalSans UI variable font in the layout. Updated text size tokens to match Inter’s scale for consistent sizing.

• Refactors
  • Replaced next/font/google Inter with next/font/local CalSansUI[MODE,wght].woff2 for --font-sans.
  • Added the CalSansUI font file under apps/web/fonts.
  • Adjusted CSS tokens for text sizes and line-heights (xs, sm, base, lg) to match Inter metrics.

^{Written for commit 61eb10b151356f76dea70be4f3caf0d72f3cbea4. Summary will update automatically on new commits.}

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Project	Deployment	Preview	Comments	Updated (UTC)
cal-companion	Ready	Preview	Comment	Dec 11, 2025 10:44am

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