implement expression validation and build script setup in workspace

public/icons/Condition.svg

@@ -1 +1 @@
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+<svg stroke="currentColor" fill="currentColor" stroke-width="0" viewBox="0 0 24 24" height="1em" width="1em" xmlns="http://www.w3.org/2000/svg"><path fill="none" d="M0 0h24v24H0z"></path><path d="M11.07 12.85c.77-1.39 2.25-2.21 3.11-3.44.91-1.29.4-3.7-2.18-3.7-1.69 0-2.52 1.28-2.87 2.34L6.54 6.96C7.25 4.83 9.18 3 11.99 3c2.35 0 3.96 1.07 4.78 2.41.7 1.15 1.11 3.3.03 4.9-1.2 1.77-2.35 2.31-2.97 3.45-.25.46-.35.76-.35 2.24h-2.89c-.01-.78-.13-2.05.48-3.15zM14 20c0 1.1-.9 2-2 2s-2-.9-2-2 .9-2 2-2 2 .9 2 2z"></path></svg>