This makes the inline assistant editor use the line height value
configured in the settings, and fixes cut-off button creases:

| Before | After |
|--------|--------|
| <img width="656" height="276" alt="Screenshot 2026-01-27 at 11  55@2x"
src="https://github.com/user-attachments/assets/fbb19e54-6663-4f7e-b706-b012fbfa2c99"
/> | <img width="656" height="274" alt="Screenshot 2026-01-27 at 11 
54@2x"
src="https://github.com/user-attachments/assets/4577b752-3e18-45c7-9657-02919047f8ba"
/> |

Release Notes:

- Agent: Fixed cut-off mention creases in the inline assistant.