milestone 29: activity — history, live and policy simulation on one surface

query log, live and lookup merge into /activity. history filters live
in the url, so a pasted link or back/forward reproduces the exact
view; the result column separates servfail and nxdomain from success
in the list. live is follow-by-default with freeze, and a streamed
row opens its in-memory provenance detail — no correlation invented
for rows sqlite has not written. lookup survives as the current
policy simulation under /activity/test. investigation links carry
absolute bounds, and the diagnostics page now honors since/until
instead of ignoring them. the old routes are gone without aliases.

admin/src/features/diagnostics/DiagnosticsPage.test.tsx

@@ -337,3 +337,38 @@ test("an episode links to its own detail page", async () => {
 	const link = await screen.findByRole("link", { name: "Blocklist source failed to update" });
 	expect(link.getAttribute("href")).toBe("/diagnostics/42");
 });
+
+test("an absolute window reaches both requests and is stated on the page", async () => {
+	const bounded = "since=1699999700&until=1700000300";
+	responses[`/api/diagnostics?${bounded}&state=active`] = ACTIVE;
+	responses[`/api/diagnostics?${bounded}&state=resolved`] = RESOLVED;
+	renderRoute(`/diagnostics?${bounded}`);
+
+	await screen.findByRole("heading", { name: "Active" });
+	expect(requested).toContain(`/api/diagnostics?${bounded}&state=active`);
+	expect(requested).toContain(`/api/diagnostics?${bounded}&state=resolved`);
+	// An empty section inside a five-minute window means something different
+	// from an empty section over the whole history, so the page has to say so.
+	expect(screen.getByText(/Showing events that overlap/)).toBeTruthy();
+});
+
+test("clearing the range drops both bounds from the url", async () => {
+	const bounded = "since=1699999700&until=1700000300";
+	responses[`/api/diagnostics?${bounded}&state=active`] = ACTIVE;
+	responses[`/api/diagnostics?${bounded}&state=resolved`] = RESOLVED;
+	const router = renderRoute(`/diagnostics?${bounded}`);
+
+	fireEvent.click(await screen.findByRole("button", { name: "Clear the time range" }));
+	await waitFor(() => {
+		expect(router.state.location.search).not.toContain("since");
+	});
+	expect(router.state.location.search).not.toContain("until");
+});
+
+test("a bound that is not a whole second is dropped, leaving the page unbounded", async () => {
+	renderRoute("/diagnostics?since=1.5&until=Infinity");
+
+	await screen.findByRole("heading", { name: "Active" });
+	expect(requested).toContain("/api/diagnostics?state=active");
+	expect(screen.queryByText(/Showing events that overlap/)).toBeNull();
+});