fix(frontend): preserve Pi auth asset guidance

frontend/src/shell/PiManagement.test.tsx

@@ -299,6 +299,23 @@ test("shows a seven-step host-terminal workflow in scrollable platform tabs", as
   expect(windows).toHaveTextContent('& (Resolve-Path "~\\bin\\thothctl-windows-amd64.exe") --installation (Resolve-Path "~\\thothii-installation.yaml") pi maintenance recover --yes');
 });
 
+test("keeps the required PI_AUTH_FILE guidance in one static text node", async () => {
+  const user = userEvent.setup();
+  renderManagement();
+
+  const tablist = await screen.findByRole("tablist", { name: "Pi host platform" });
+  await user.click(within(tablist).getByRole("tab", { name: "Linux" }));
+  const credentialStep = screen.getByRole("heading", { name: "Set the provider credential" }).closest("li");
+  const guidance = credentialStep?.querySelector("p");
+
+  expect(
+    Array.from(guidance?.childNodes ?? []).some(
+      (node) => node.nodeType === Node.TEXT_NODE
+        && node.textContent?.includes("PI_AUTH_FILE is a setting in the installation environment file"),
+    ),
+  ).toBe(true);
+});
+
 test("reloads installation defaults when the panel is reopened", async () => {
   let statusCalls = 0;
   server.use(http.get("/api/pi-management/status", () => {