feat: flag to show more digits in size column

Right now eza shows 3 characters for filesize, as below. Sometimes that makes files hard to compare, when they all have filesizes of 2.3Gi, for example. A flag to increase the number of characters shown to 4 (or an arbitrary amount) would be helpful. <img width="411" height="309" alt="Image" src="https://github.com/user-attachments/assets/a4d93824-974e-4461-b3a6-1818ee22e156" />