implement expression validation and build script setup in workspace

public/icons/Decorator.svg

@@ -1 +1 @@
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+<svg stroke="currentColor" fill="currentColor" stroke-width="0" viewBox="0 0 512 512" height="1em" width="1em" xmlns="http://www.w3.org/2000/svg"><path fill="none" stroke-linecap="round" stroke-linejoin="round" stroke-width="48" d="M200.66 352H144a96 96 0 0 1 0-192h55.41m113.18 0H368a96 96 0 0 1 0 192h-56.66m-142.27-96h175.86"></path></svg>