Redesign idea (#343)

* Redisign idea

* Code cleanup

* Fixed to right container

* Reoredered layout

* Reordering panels

* Export dialog

* Removed redunant code

* Fixed not removing temp canvas

* Fixed preview not using only selected elements

* Returned file name on export

* Toggle export selected/all elements

* Hide copy to clipboard button if no support of clipboard

* Added border to swatches

* Fixed modal flickering

src/components/Popover.tsx

@@ -1,4 +1,5 @@
 import React, { useLayoutEffect, useRef } from "react";
+import "./Popover.css";
 
 type Props = {
   top?: number;