polish(web): search pill aria-pressed, keepPreviousData, plural result count, URL-hydration test

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/src/search/search.test.tsx

@@ -1,5 +1,5 @@
 import { expect, test } from "vitest";
-import { screen, waitFor } from "@testing-library/react";
+import { screen, waitFor, within } from "@testing-library/react";
 import userEvent from "@testing-library/user-event";
 import { http, HttpResponse } from "msw";
 import { Route, Routes } from "react-router-dom";
@@ -75,3 +75,16 @@ test("clicking a result shows the object in the detail pane", async () => {
 
   expect(await screen.findByText(amphora.object_name)).toBeInTheDocument();
 });
+
+test("hydrates query and visibility from the initial URL", async () => {
+  renderApp(tree(), { route: "/search?q=bronze" });
+
+  expect(screen.getByLabelText(/search the collection/i)).toHaveValue("bronze");
+  expect(await screen.findByText("Bronze figurine")).toBeInTheDocument();
+
+  const { container } = renderApp(tree(), { route: "/search?q=bronze&visibility=internal" });
+
+  expect(
+    within(container).getByRole("button", { name: /^internal$/i }),
+  ).toHaveAttribute("aria-pressed", "true");
+});