Review design system + Planning

[omnat]

Design system day (later this week or next week)

• Review design system as we have today
• Plan out the components
• Design priorities for highest impact items to address first from design-dev perspectives

[omnat]

Past discussions on Design System: https://docs.google.com/document/d/1aUdaBMKVT8wrEpLee2Y6Xkk-s_95K-5K36-TPMJuu28/edit

Development issues: https://github.com/MetaMask/metamask-extension/issues/6804 https://github.com/MetaMask/metamask-extension/issues/6369