fix(diagnostics): a pivot or Back applies the search text at once

The query read the typing-debounced search, so for 300 ms after a jump it mixed the new view's
filters with the old view's text and fetched rows neither view shows. useDebounced takes a settle key
whose change applies the value immediately.

frontend/src/components/AdminLogs.tsx

@@ -82,12 +82,16 @@ export default function AdminLogs() {
     setLiveState(on);
   };
   const [open, setOpen] = useState<number | null>(null);
-  const q = useDebounced(state.q, 300);
+  // Bumped when the view changes by a jump (a pivot, Back/Forward) rather than by typing: the
+  // search box's text then applies at once instead of after the typing debounce.
+  const [jumps, setJumps] = useState(0);
+  const q = useDebounced(state.q, 300, jumps);
   useUrlMirror(logsParamUpdates(state));
   // Back/Forward lands on another view of the console (a pivot pushed one, below): read it back.
   useEffect(() => {
     const onPop = () => {
       setOpen(null);
+      setJumps((n) => n + 1);
       setState(logsParamsToState(new URLSearchParams(window.location.search)));
     };
     window.addEventListener("popstate", onPop);
@@ -206,6 +210,7 @@ export default function AdminLogs() {
       urlWithParams(logsParamUpdates(next)),
     );
     notifyNav();
+    setJumps((n) => n + 1);
     update(next);
   };