The right sidebar has been updated to the ‘solid’ variant for improved interaction with IconButtons.
It is now darker than the left sidebar, creating better relative contrast and lifting the left
sidebar higher on the screen. Additionally, the styles are consistent whether in light or dark mode,
addressing previous issue where the right sidebar appeared higher/lower based on the color
scheme.

1. **Avatar Visibility Improvement:** Previously, when the avatar contained a picture, the interaction was hidden. But now, it's fixed, You’ll see the hover, active, and all the props
that we expect from a button. (tested on dark/light mode).

2. **Plus Icon Enhancement:** The plus icon shape used to look distorted. We’ve standardized the size for all icon buttons in the right sidebar. Additionally, we’ve ensured that they are neatly aligned using align-items.

If there are several users online, it’s a good idea to use the color ‘success’ for all badges with `color="success"`.

ps: the badgecolorsuccess import was removed, it isn't needed.