Adopt shared WebUI structural primitives

webui/src/styles/organizations.css

@@ -1,30 +1,3 @@
-.organizations-workspace {
-  grid-template-columns: 230px minmax(0, 1fr);
-  background: var(--bg);
-}
-
-.organizations-page {
-  display: grid;
-  gap: 18px;
-  width: 100%;
-}
-
-.organizations-admin-page {
-  max-width: 100%;
-}
-
-.organizations-heading {
-  margin-bottom: 4px;
-}
-
-.organizations-toolbar {
-  display: flex;
-  align-items: center;
-  justify-content: flex-end;
-  gap: 12px;
-  flex-wrap: wrap;
-}
-
 .organizations-check-list {
   display: grid;
   gap: 10px;
@@ -67,11 +40,6 @@
   color: var(--muted);
 }
 
-@media (max-width: 900px) {
-  .organizations-workspace {
-    grid-template-columns: 1fr;
-  }
-}
 .organization-upgrade-toolbar {
   display: grid;
   grid-template-columns: minmax(16rem, 1fr) auto;