`.annotorious-popup-button` anchors exposed to screen reader / keyboard users on public side exhibit pages

When navigating an exhibit page with Image Annotation blocks added to it, focus moves through the non-visible .annotorious-popup-button anchor elements, which produce screen reader announcements of "link, EDIT" and "link, DELETE":

https://github.com/user-attachments/assets/2c58be3c-e3b2-4d60-a4d2-1fd82a43a818

Video description: Navigating an exhibit page via keyboard with a VoiceOver dialog open. Within an Image Annotation block, under the image, focus grabs onto two non-visible elements in sequence, which read out as "link, EDIT" and "link, DELETE".

This is true for viewing as a logged in or logged out user and occurs in all Image Annotation blocks, regardless of if annotations have been added to a given image. These should be hidden to screen readers / keyboard users. This is not specific to a branch and is happening on both render-alt-text and master.

Start by reproducing the issue on a public exhibit page containing an Image Annotation block, then inspect the non-visible .annotorious-popup-button anchors. Done means keyboard and screen-reader navigation no longer reaches or announces the EDIT and DELETE links, for both logged-in and logged-out views and whether or not annotations exist.