* Fix gradients spacings on the space panel
Make the gradients two separate ones so they can be fixed pixel widths
from the top & bottom rather than percentages of the height.
Tweak the spacings between the user menu & threads panel to match
the figma and from Gaelle's design.
* Update snapshots
* More screenshots
* Use Compound primary colors for most actions
The "accent" color variable is something we should generally not use anymore: it maps to a Compound text token, which makes its semantics inappropriate for icons and backgrounds, and it clashes with the primary colors present on the Compound components we're now bringing into the app. As discussed with design, we would like to phase out its usage on interactive components in favor of the correct icon and background colors from Compound. This is a best-effort attempt at applying new colors to all the major places that we were previously using "accent": mainly, buttons and form controls are affected.
* Update some more colors
* Update test snapshots
* Fix broken screenshot
