swarm ui: one review page

The two review tabs, runs and try-out, are one: /review. It is a column of
three sections: try a classification and the classifier settings, each a
folded bar (the settings' bar says what they are now), then the recent runs,
always open. The settings had been pinned under the try-out form; they are now
a section of their own. A new Disclosure primitive is the folding bar, a
native details wearing the Panel's classes, so the folded and open sections
read as the same surface.

/review-runs and /review-tryout are gone, with no redirect.

frontend/packages/swarm-ui/src/pages/review/ReviewPage.tsx

@@ -0,0 +1,20 @@
+// <ReviewPage> — the review classifier on one page (`docs/swarm/ui.md`,
+// "Review"): the way to try a classification on a PR, the classifier's own
+// settings, and the runs it has done. The first two fold, since they are
+// used now and then and a folded header says what is in them; the runs are
+// what the page is for, so they are always in view, under the two bars.
+// Each part keeps its own data and requests: this page only lays them out.
+import { ClassifierSettings } from "../review-settings/ClassifierSettings.js";
+import { ReviewRuns } from "../review-runs/ReviewRuns.js";
+import { ReviewTryOut } from "../review-tryout/ReviewTryOut.js";
+import "./ReviewPage.css";
+
+export function ReviewPage() {
+  return (
+    <div class="ui-review-page">
+      <ReviewTryOut />
+      <ClassifierSettings />
+      <ReviewRuns />
+    </div>
+  );
+}