Updates to the tooltip design

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🗺 Overview

The rich content card component can be found here in Figma. It was styled this way all the time since its introduction.

I guess the misalignment we see here is that we reuse this card component which usually includes buttons, but regular tooltips don't.

For visual balance we could define it as:

• rich tooltips/cards that include a header use 10px border radius
• regular single line tooltips use 5px border radius.

🔗 Reference

https://github.com/Doist/Issues/issues/9290