fix: restore translucent dashboard styling (#6664)

* fix: restore translucent dashboard styling

* fix: restore dashboard widget transparency

* fix: address dashboard review feedback

* fix: apply board opacity to containers

* fix: flatten demo board container

* fix: default board roundness to sm

* fix: restore assistant widget transparency

* Revert "fix: default board roundness to sm"

This reverts commit c235cbdf2b.

* fix: address remaining dashboard review comments

* test: align grid geometry expectations

packages/widgets/src/dns-hole/controls/component.module.css

@@ -1,7 +1,3 @@
-[data-mantine-color-scheme="light"] .card {
-  background-color: var(--mantine-color-gray-1);
-}
-
-[data-mantine-color-scheme="dark"] .card {
-  background-color: var(--mantine-color-dark-7);
+.card {
+  background-color: transparent;
 }