fix: preserve validation pause state and forward isEqual in re-registration

- Check form.isValidationPaused() before calling pauseValidation() so we
  don't inadvertently resume validation that was already paused externally
  (e.g. by ReactFinalForm during setup). Mirrors the pattern used in
  ReactFinalForm.tsx.
- Pass configRef.current.isEqual through the temporary registerField call
  so dirty/pristine calculation uses the field's configured equality
  comparator rather than the default reference equality.

Addresses remaining CodeRabbit review comments.

Author: Erik Rasmussen

src/useField.ts

@@ -236,20 +236,28 @@ function useField<
             // The only public API is form.setConfig('initialValues', ...) but that
             // resets ALL values. Instead, we use a workaround:
             // Trigger a re-registration which will update initialValues for this field.
-            form.pauseValidation();
+            const wasValidationPaused = form.isValidationPaused();
+            if (!wasValidationPaused) {
+              form.pauseValidation();
+            }
             try {
               // Manually update initialValues via registerField with silent: false
               // to force notification
               const unsubscribe = form.registerField(
                 name as keyof FormValues,
                 () => {},
                 {},
-                { initialValue }
+                {
+                  initialValue,
+                  isEqual: configRef.current.isEqual,
+                }
               );
               // Immediately unsubscribe to avoid orphan subscriber
               unsubscribe();
             } finally {
-              form.resumeValidation();
+              if (!wasValidationPaused) {
+                form.resumeValidation();
+              }
             }
           }
         }