preview stack, refresh token, design

frontend/src/styles.css

@@ -198,7 +198,6 @@ button.icon-button.ghost:hover:not([disabled]) {
   flex: 1;
   display: flex;
   flex-direction: column;
-  padding: 0.75rem 1.5rem 1.25rem;
   min-height: 0;
 }
 
@@ -215,6 +214,7 @@ button.icon-button.ghost:hover:not([disabled]) {
   align-items: center;
   justify-content: space-between;
   gap: 1rem;
+  padding: 0.75rem 1.5rem 0;
 }
 
 .preview-workspace__meta {
@@ -242,9 +242,6 @@ button.icon-button.ghost:hover:not([disabled]) {
 
 .preview-workspace__body {
   flex: 1;
-  background: var(--surface-subtle);
-  border: 1px solid var(--border);
-  border-radius: 2px;
   display: flex;
   align-items: center;
   justify-content: center;