Improve form property logic validation for checkbox conditions

- Update FormPropertyLogicRule to handle operators without values
- Add support for checkbox conditions like 'is_checked' and 'is_not_checked'
- Refactor logic validation in both API and client-side implementations
- Remove unnecessary console.log statements
- Update error modal text for better user experience

client/components/open/forms/components/FormEditor.vue

@@ -236,7 +236,6 @@ export default {
     saveForm() {
       // Apply defaults to the form
       const defaultedData = setFormDefaults(this.form.data())
-      console.log('defaultedData', defaultedData)
       this.form.fill(defaultedData)
   
       this.form.properties = validatePropertiesLogic(this.form.properties)

client/components/open/forms/components/form-components/FormErrorModal.vue

@@ -4,8 +4,8 @@
     @close="$emit('close')"
   >
     <div class="-mx-5">
-      <h2 class="text-red-600 text-2xl font-bold mb-4 px-4">
-        Error saving your form
+      <h2 class="text-red-600 text-2xl font-medium mb-4 px-4">
+        We couldn't save your form
       </h2>
 
       <div