Comment thread actions: hover-only controls and unlabeled buttons in ThreadsSidebar

[Ovgodd]

Hello, I'm opening a discussion about comment thread actions accessibility

In the comments sidebar, each thread has emoji and options buttons in the comment header. Two issues:

1. Hover-only controls
These buttons only appear on mouse hover. Without hovering first, they are not reachable by keyboard (Tab).

2. Unlabeled buttons
If buttons are made visible via hover, Tab can reach them but the screen reader announces only bouton with no accessible name:

Control	SR announcement
Emoji button	bouton
Options button (closed)	bouton
Options menu (open)	Modifier le commentaire, Supprimer le commentaire ✅

Menu items are fine; trigger buttons are not.

Describe the solution you'd like

1. Make action buttons keyboard-accessible, always visible in sidebar, or shown on :focus-within, not only :hover.
2. Add aria-label on emoji and options buttons (e.g. "Add reaction", "Comment options").