[Bug] When the content contains two font sizes, the toolbar font size is displayed incorrectly about univer

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Origin Title: [Bug] 内容包含两种字号时，工具栏字号展示有误

Title: [Bug] When the content contains two font sizes, the toolbar font size is displayed incorrectly

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• Is this really a problem?
• I have searched the Github Issues for similar issues, but did not find anything.

Affected packages and versions

dev

Reproduction link

Steps:

1. Enter the content and set the font size of the first half of the content to 72 and the font size of the second half to 20.
2. Enter the content in the font size area 72, and then return to the second half to enter the content.
3. Observe the toolbar font size

Expected behavior

Enter the content in the first half and then return to the second half. The toolbar will display the number 20 in the second half.

Actual behavior

Enter content in the first half and then return to the second half. The toolbar will display number 72.

https://github.com/dream-num/univer/assets/167171356/053f8afb-6331-422f-b639-26f73a886c61

System information

No response