feat: consolidate shared UI and harden browser authority for release

webui/conformance/CampaignWorkspaceScenario.tsx

@@ -0,0 +1,28 @@
+// Exercise the owning Campaign hook, with network responses controlled by tests.
+import { useMemo, useState } from "react";
+import { useSearchParams } from "react-router";
+import { useCampaignWorkspaceData } from "../../../govoplan-campaign/webui/src/features/campaigns/hooks/useCampaignWorkspaceData";
+
+export default function CampaignWorkspaceScenario() {
+  const [campaignId, setCampaignId] = useState("campaign-a");
+  const [accessToken, setAccessToken] = useState("token-a");
+  const [, setSearchParams] = useSearchParams();
+  const settings = useMemo(() => ({ apiBaseUrl: "", apiKey: "", accessToken }), [accessToken]);
+  const { data, loading, error, reload } = useCampaignWorkspaceData(settings, campaignId, { includeVersions: true });
+  return <main>
+    <button onClick={() => void reload()}>Reload workspace</button>
+    <button onClick={() => void reload({ force: true })}>Force reload workspace</button>
+    <button onClick={() => setCampaignId("campaign-b")}>Switch campaign</button>
+    <button onClick={() => setAccessToken("token-b")}>Switch identity</button>
+    <button onClick={() => setSearchParams((current) => {
+      const next = new URLSearchParams(current);
+      next.set("version", "selected-version");
+      return next;
+    })}>Select version</button>
+    <output data-testid="workspace-campaign">{data.campaign?.id ?? "none"}</output>
+    <output data-testid="workspace-version">{data.currentVersion?.id ?? "none"}</output>
+    <output data-testid="workspace-revision">{data.currentVersion?.edit_revision ?? 0}</output>
+    <output data-testid="workspace-loading">{String(loading)}</output>
+    <output data-testid="workspace-error">{error}</output>
+  </main>;
+}