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/uptime-kuma/component.module.css

@@ -16,7 +16,8 @@
   gap: clamp(8px, 3cqi, 18px);
   flex-shrink: 0;
   padding-bottom: clamp(4px, 2cqi, 10px);
-  border-bottom: 1px solid light-dark(var(--mantine-color-gray-2), var(--mantine-color-dark-4));
+  border-bottom: 1px solid
+    rgb(from var(--mantine-color-default-border) r g b / calc(var(--opacity, 1) * 0.45));
 }
 
 .heroExpanded {
@@ -83,7 +84,9 @@
   gap: clamp(2px, 1.5cqi, 5px);
   padding: clamp(4px, 2.5cqi, 10px);
   border-radius: var(--mantine-radius-md);
-  background-color: light-dark(var(--mantine-color-gray-0), var(--mantine-color-dark-6));
+  border: 1px solid
+    rgb(from var(--mantine-color-default-border) r g b / calc(var(--opacity, 1) * 0.45));
+  background-color: transparent;
   overflow: hidden;
 }