Font Area Not Properly Set When Applying lineHeight and fontSize to Page

**Describe the bug**
I'm experiencing an issue with font rendering after upgrading from v3.4.4 to v4.x (tested with v4.0.0 and v4.1.5). When applying lineHeight and fontSize to the page, the font area is not being correctly calculated.

When examining the current implementation, I noticed that title and author elements with different font sizes are both rendering with a consistent 18px height, which appears to be unexpected behavior.

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**To Reproduce**
[Please click this link](https://react-pdf.org/repl?code=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and see styles.body

**Expected behavior (v3.4.4)**
- Different font sizes should result in proportionally different line heights
- Font area should accurately reflect the specified font sizes

**Current Behavior (v4.x)**

- Different font sizes result in uniform 18px height
- Font area does not adapt correctly to size changes

**Screenshots**

**Desktop (please complete the following information):**

- OS: MacOS
- Browser chrome
- React-pdf version v4.1.5, v4.0.0