refillNewFields function

async function refillNewFields(previousSignature: string): Promise<void> {
  isFillingInProgress = true;
  try {
    const oldKeys = parseSignature(previousSignature);
    const { fields } = await detectAllFieldsAsync();

    const newFields = fields.filter((f) => {
      const key = `${f.selector}:${f.fieldType}`;
      return !oldKeys.has(key);
    });

    if (newFields.length === 0) {
      log.debug("No truly new fields to fill");
      return;
    }

    const url = window.location.href;
    const ignoredFields = await getIgnoredFieldsForUrl(url);
    const ignoredSelectors = new Set(ignoredFields.map((f) => f.selector));
    const fieldsToFill = newFields.filter(
      (f) => !ignoredSelectors.has(f.selector),
    );

    if (fieldsToFill.length === 0) {
      log.debug("Todos os novos campos são ignorados — skip");
      return;
    }

    log.info(`Filling ${fieldsToFill.length} new field(s) only`);
    for (const field of fieldsToFill) {
      await fillSingleField(field);
    }

    lastFieldSignature = getCurrentFieldSignature();
  } finally {
    isFillingInProgress = false;
  }
}