fix(ui): constrain long dropdowns to the viewport (#2106)

src/ui/Select.module.css

@@ -91,7 +91,8 @@
   overflow: hidden;
 }
 .optionLabel {
-  flex: 1 0 auto;
+  flex: 1 1 auto;
+  min-width: 0;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;