const values = {};
    for (const k of dirty) {
      const inp = $(`#rows [data-key="${CSS.escape(k)}"]`);
      values[k] = inp.value;
    }
    try {
      const d = await POST("/settings/save-batch", { values });
      const errs = d.errors || {};
      const nApplied = Object.keys(d.applied || {}).length;
      if (nApplied) toast(`Saved ${nApplied} setting(s)`, "ok");
      if (Object.keys(errs).length) toast("Some values rejected: " + JSON.stringify(errs), "err", 8000);
      await load();
    } catch (err) { toast("Save failed: " + err.message, "err"); }
  });

  $("#rows").addEventListener("click", (e) => {
    const b = e.target.closest("button"); if (!b || !b.dataset.reset) return;
    confirmedAction(`Reset “${b.dataset.reset}” to its default value?`, async () => {
      await POST("/settings/reset", { key: b.dataset.reset, value: "" });
      toast("Reset to default", "ok"); await load();
    });
  });

  $("#btnResetCat").addEventListener("click", () => {
    const keys = settings.filter(s => s.category === cat && !s.is_default).map(s => s.key);
    if (!keys.length) { toast("All settings in this category already use defaults"); return; }
    confirmedAction(`Reset all customized settings in “${cat}”?`, async () => {
      for (const k of keys) await POST("/settings/reset", { key: k, value: "" });
      toast(`Reset ${keys.length} setting(s)`, "ok"); await load();
    });
  });

  $("#btnResetAll").addEventListener("click", () => confirmedAction(
    "Reset ALL settings to defaults across every category?", async () => {
      const d = await POST("/settings/reset-all");
      toast(`Reset ${d.reset} settings`, "ok"); await load();
    }));

  await load();
};
=== settings list ===
financial | amount_min | float | True
financial | amount_max | float | True
financial | shipping_min | float | True
financial | shipping_max | float | True
financial | invoice_format | str | True
financial | invoice_prefix | str | True
limits | default_daily_limit | int | True
limits | default_campaign_limit | int | True
limits | default_max_per_account | int | True
limits | default_send_interval | float | True
limits | default_rate_per_minute | int | True
attachments | attachment_kind | str | True
compliance | unsubscribe_enabled | bool | True
compliance | unsubscribe_base_url | str | True
general | company_name | str | True
general | test_email_default | str | True