feat: Custom accent color (#4897)

* types

* Working, but messy

* Add InputColor component

* types

* Show default theme values when not customized

* Support custom theme on team sign-in page

* Payload validation

* Custom theme on shared documents

* Improve theme validation

* Team -> Workspace in settings

app/components/List/Item.tsx

@@ -52,7 +52,7 @@ const ListItem = (
         $border={border}
         $small={small}
         activeStyle={{
-          background: theme.primary,
+          background: theme.accent,
         }}
         {...rest}
         as={NavLink}