[Palette] Show hex code on hover

**Description**
Currently, we only show the mouse button hint text. Would be useful to also see the hex code for the color. `#FFFF00`

**Additional context**

<img width="406" height="73" alt="Image" src="https://github.com/user-attachments/assets/5932a914-11ae-434f-8485-bad23ef8362a" />