Choose **one** icon library and stick with it

[frankie567]

Currently, we've three icons libraries in use across the project:

• Lucide (lucide-react)
• Heroicons (@heroicons/react)
• Material Icons (@mui/icons-material)
• and probably a bunch of copy-pasted SVG

This is a bit messy, adds lot of useless dependencies and probably hurt visual consistency. We really need to make a choice here and stick with it.

Worth to note that shadcn uses natively lucide-react, so that's probably the most pragmatic choice.

[emilwidlund]

@frankie567 Good call. I'll assign this to me.