Relevant Linear issue here.
This diff adds styling changes to MessageTimestampTooltip, specifically changing the color of the tooltip, increasing the width of the tooltip (so it is at minimum the width of the MessageTooltip with the reply/create thread buttons), some padding, and makes the border radius match the MessageTooltip.
Depends on D4704.
For other tooltip actions we don't need to manually set this style. Can we use the mechanism we already have, or are there any reasons for not doing so?