[DESIGN] Finalize Sidebar design

[k1eu]

Short overview

We do have some design for the sidebar in place already. We just need to make sure it's the final form & possibly handle dark mode if easy (might be okay for darkmode already)

• [ ] Finalize the design
• [ ] Inform dev task about ready to develop state

Notes

Figma

Deadline

ASAP

Contact points

@michalgren