fix(settings): correct invoke payload keys and error handler routing

- folder_ids: use snake_case in both set_tagging_queue_folder_ids invoke
  calls (toggleTaggingQueueFolder and setTaggingQueueFolderIds) to match
  the Rust SetTaggingQueueFolderIdsParams serde field name
- threshold save error: route setTaggerThreshold() catch to
  setTaggerThresholdError instead of setTaggerQueueStatus so the error
  surfaces next to the threshold input, not the queue targets card

src/components/SettingsModal.tsx

@@ -394,7 +394,7 @@ export function SettingsModal() {
                                   setTaggerThresholdError(null);
                                   setTaggerThresholdSaving(true);
                                   void setTaggerThreshold(value)
-                                    .catch((error: unknown) => setTaggerQueueStatus(String(error)))
+                                    .catch((error: unknown) => setTaggerThresholdError(String(error)))
                                     .finally(() => {
                                       setTaggerThresholdDraft(null);
                                       setTaggerThresholdSaving(false);