Cell formatting is not being applied to text, after inline text editing

[seleckis]

Describe the bug When part of text is being styled then the formatting of the cell is not being applied

To Reproduce Steps to reproduce the behavior:

1. Add some text to cell
2. Change text size to e.g. 24
3. Select a part of text
4. Change formatting to e.g. bold
5. Select another cell

Expected behavior Text remains of size 24.

Actual result Text changes its size to default 10.

https://github.com/ruilisi/fortune-sheet/assets/988504/bf32c113-d589-4bfe-8137-d58cc84a8bff

[gazedreamily]

@seleckis This issue will be fixed in #481