update unprocessed inputs after recording user input

-- Part of the fix for e-mission/e-mission-docs#1034

When a user input is recorded, we put it in storage. For snappy performance we also cache it in the timelineLabelMap / timelineNotesMap state.
However, if we switch filters or load more trips, this state gets overridden. So, we need to call updateLocalUnprocessedInputs at some point.
It is an async function but we can call it without 'await' and just allow it to execute in the background.

www/js/diary/LabelTab.tsx

@@ -338,6 +338,9 @@ const LabelTab = () => {
       };
       setTimelineNotesMap(newTimelineNotesMap);
     }
+    /* we can update unprocessed inputs in the background, without blocking the UI,
+      so this is not 'await'ed */
+    updateLocalUnprocessedInputs(pipelineRange, appConfig);
   }
 
   const contextVals = {