fix nudge display on settings/webhooks

[Pascal-Delange]

Issues

• "nudge" button is invisible if the side bar is folded (which should increasingly be its default status)
• "webhooks" nudge button in setting was not handling all the cases where it should be displayed
• "upgrade" button link in the hover did not do anything on click, only on "ctrl+click"

Attempts

• I tried to make the nudge a miniature when the side bar is folded. I managed to make something that feels about right on the initial render, but the icon shifts back over the analytics page logo on the client re-render. I wasn't able to fix this.
• on the webhooks setting page, the nudge logo flickers around when we refresh the page, if the webhooks setting page is selected

server render:

client render:

Some of the changes in this PR have been made with cursor, handle with care (especially the css)

[linear]

MAR-1224 Analytics page is no longer restricted by feature access

[ChibiBlasphem]

I fixed:

• Hydration on left sidebar (nudge contains a "" which was inside the SidebarLink - which is also a )
• Refactor Nudge styles to use class-variance-authority
• Hoist the stopPropagation in the content rather than <a> to avoid trigger parent element when clicking in the hover card.

[Pascal-Delange]

Can't approve my own PR, but LGTM!