Polish live workspace export layout

frontend/src/styles/app.css

@@ -1222,6 +1222,10 @@ button.entity-card {
   gap: 0.55rem;
 }
 
+.export-center .handoff-readiness-grid {
+  grid-template-columns: repeat(auto-fit, minmax(7.5rem, 1fr));
+}
+
 .handoff-readiness-grid > div {
   min-width: 0;
   border: 1px solid var(--line);
@@ -1253,7 +1257,7 @@ button.entity-card {
 
 .handoff-action-grid {
   display: grid;
-  grid-template-columns: repeat(3, minmax(0, 1fr));
+  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
   gap: 0.6rem;
   grid-column: 1 / -1;
   width: 100%;