The preview images have inconsistent sizes.

<img width="198" height="132" alt="Image" src="https://github.com/user-attachments/assets/5f4fbbb6-12e0-479b-8308-81eaf8558846" />
When switching to a larger icon and then back, a preview image of the same size can be generated. However, when pressing F5 to refresh, it will revert to a preview image of different sizes.