[Feature] Add BrushIcon to Sistent

[rishiraj38]

Desired Behavior

Create a BrushIcon in Sistent to reduce dependency on @mui/icons-material and ensure design consistency across Layer5 products. This is required to preserve the exact UX in Meshery's UrlStepper component without visual regression.

Mockups

https://mui.com/material-ui/material-icons/?query=Brush&selected=Brush

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Contributor Guide

• 🎨 Wireframes and designs for Sistent site in Figma (open invite)

[icoderarely]

Hey, I would like to work on this issue, can you assign it to me