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.dom.test.tsx

@@ -158,6 +158,10 @@ describe("AdminLogs", () => {
     expect(screen.queryByText("adminLogs.pivotRequest:req-00000001")).toBeNull();
     const url = new URLSearchParams(window.location.search);
     expect([url.get("lreq"), url.get("lgrp"), url.get("lq")]).toEqual([null, "error", "boom"]);
+    // Neither jump waited out the typing debounce: no read ever mixed one view's filters with the
+    // other's search text (the request with "boom", or the restored view without it).
+    const mixed = logsMock.mock.calls.filter(([q]) => (q.request_id != null) === (q.q === "boom"));
+    expect(mixed).toEqual([]);
   });
 
   it("keeps the account in use offered when the facets no longer count it", async () => {

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);
   };