Fix union SQL and selection previews

webui/src/styles/dataflow.css

@@ -343,20 +343,9 @@
   gap: 5px;
 }
 
-.dataflow-alerts {
-  position: absolute;
-  z-index: 12;
-  top: 66px;
-  right: 12px;
-  display: grid;
-  width: min(500px, calc(100% - 24px));
-  gap: 6px;
-  pointer-events: none;
-}
-
-.dataflow-alerts .alert {
-  pointer-events: auto;
-  box-shadow: var(--shadow-popover);
+.dataflow-command-bar .toggle-switch-row {
+  min-height: 34px;
+  white-space: nowrap;
 }
 
 .dataflow-editor {
@@ -923,9 +912,14 @@
   flex-wrap: wrap;
 }
 
-.dataflow-results-view-controls select {
-  width: clamp(150px, 22vw, 280px);
-  min-height: 30px;
+.dataflow-preview-stage {
+  max-width: min(36vw, 320px);
+  overflow: hidden;
+  color: var(--text-strong);
+  font-size: 12px;
+  font-weight: 650;
+  text-overflow: ellipsis;
+  white-space: nowrap;
 }
 
 .dataflow-preview-table-wrap,