Long quota names break signup buttons

If quota name is long, the button text overflows:

<img width="435" height="249" alt="Image" src="https://github.com/user-attachments/assets/eb031174-ad7f-48e3-a7c8-771286ae9575" />

Additionally the width of the signup sidebar is very dynamic, and length of the quota names affects it notably. Similarly countdown implemented in #815 causes some layout shifts