refactor(form-input-item): enhance type switch logic to include select input handling

web/app/components/workflow/nodes/_base/components/form-input-item.tsx

   const isSelect = type === FormTypeEnum.select || type === FormTypeEnum.dynamicSelect
   const isAppSelector = type === FormTypeEnum.appSelector
   const isModelSelector = type === FormTypeEnum.modelSelector
-  const showTypeSwitch = isNumber || isBoolean || isObject || isArray
+  const showTypeSwitch = isNumber || isBoolean || isObject || isArray || isSelect
   const isConstant = varInput?.type === VarKindType.constant || !varInput?.type
   const showVariableSelector = isFile || varInput?.type === VarKindType.variable
 
       return VarType.arrayFile
     else if (type === FormTypeEnum.file)
       return VarType.file
-    // else if (isSelect)
-    //   return VarType.select
+    else if (isSelect)
+      return VarType.string
     // else if (isAppSelector)
     //   return VarType.appSelector
     // else if (isModelSelector)
           onChange={handleValueChange}
         />
       )}
-      {isSelect && (
+      {isSelect && isConstant && (
         <SimpleSelect
           wrapperClassName='h-8 grow'
           disabled={readOnly}