ui-default: init

将ui-default合并至主存储库便于维护

packages/ui-default/components/scratchpad/PanelButton.page.styl

@@ -0,0 +1,15 @@
+@import './var.inc.styl'
+
+.scratchpad__panel-button
+  background: none
+  border: 0
+  line-height: rem($panel-header-height)
+  margin: 0
+  color: #FFF
+  padding: rem(0 5px)
+  cursor: pointer
+  font-size: rem($font-size-small)
+  outline: 0
+
+  &:hover
+    color: $tab-color