Fillet UI (#2718)

* draft: fillet ast mod + test

* Kurt's rejig

* playwright

* update button enable logic

* remove fillet button in production build

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu)

* trigger CI

* fix typo

* give a way to turn on fillets

---------

Co-authored-by: max-mrgrsk <margorskyi@gmail.com>
Co-authored-by: max-mrgrsk <156543465+max-mrgrsk@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

src/lib/useCalculateKclExpression.ts

@@ -6,7 +6,7 @@ import { PrevVariable, findAllPreviousVariables } from 'lang/queryAst'
 import { Value, parse } from 'lang/wasm'
 import { useEffect, useRef, useState } from 'react'
 import { executeAst } from 'lang/langHelpers'
-import { trap } from 'lib/trap'
+import { err, trap } from 'lib/trap'
 
 const isValidVariableName = (name: string) =>
   /^[a-zA-Z_][a-zA-Z0-9_]*$/.test(name)
@@ -86,6 +86,7 @@ export function useCalculateKclExpression({
     const execAstAndSetResult = async () => {
       const _code = `const __result__ = ${value}`
       const ast = parse(_code)
+      if (err(ast)) return
       if (trap(ast, { suppress: true })) return
 
       const _programMem: any = { root: {}, return: null }