Remove column count limit

### Problem I have

Currently, phanpy limits the number of columns/shortcuts to 9. I heavily make use of user lists to bin my timeline and a horizontally scroll-able column view as my default view. I have more than 9 lists.

### Solution I'd like

Remove limit from column count or set it to a high number.

### Alternatives considered

_No response_

### Other

I use feature on Twitter as well but it's critical on Mastodon to avoid super-poster drown out.