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 () => {