fix: autosigning fields with direct links (#1696)

## Description

The changes in `sign-direct-template.tsx` automatically fill in field
values for text, number, and dropdown fields when default values are
present or if the fields are read-only. In `checkbox-field.tsx`, the
changes fix the checkbox signing by checking if the validation is met
and improving how it saves or removes checkbox choices.

## Testing Performed

I tested the code locally with a variety of documents/fields.

## Checklist

<!--- Please check the boxes that apply to this pull request. -->
<!--- You can add or remove items as needed. -->

- [x] I have tested these changes locally and they work as expected.
- [ ] I have added/updated tests that prove the effectiveness of these
changes.
- [ ] I have updated the documentation to reflect these changes, if
applicable.
- [x] I have followed the project's coding style guidelines.
- [ ] I have addressed the code review feedback from the previous
submission, if applicable.

apps/remix/app/components/general/document-signing/document-signing-checkbox-field.tsx

@@ -97,6 +97,10 @@ export const DocumentSigningCheckboxField = ({
 
   const onSign = async (authOptions?: TRecipientActionAuth) => {
     try {
+      if (!isLengthConditionMet) {
+        return;
+      }
+
       const payload: TSignFieldWithTokenMutationSchema = {
         token: recipient.token,
         fieldId: field.id,
@@ -194,18 +198,30 @@ export const DocumentSigningCheckboxField = ({
 
       setCheckedValues(updatedValues);
 
-      await removeSignedFieldWithToken({
+      const removePayload: TRemovedSignedFieldWithTokenMutationSchema = {
         token: recipient.token,
         fieldId: field.id,
-      });
+      };
 
-      if (updatedValues.length > 0) {
-        await signFieldWithToken({
+      if (onUnsignField) {
+        await onUnsignField(removePayload);
+      } else {
+        await removeSignedFieldWithToken(removePayload);
+      }
+
+      if (updatedValues.length > 0 && shouldAutoSignField) {
+        const signPayload: TSignFieldWithTokenMutationSchema = {
           token: recipient.token,
           fieldId: field.id,
           value: toCheckboxValue(updatedValues),
           isBase64: true,
-        });
+        };
+
+        if (onSignField) {
+          await onSignField(signPayload);
+        } else {
+          await signFieldWithToken(signPayload);
+        }
       }
     } catch (err) {
       console.error(err);