fix(ui): a page's sub-tab is remembered per browser tab, not forever

Settings, Configuration, Statistics and Users kept the last sub-tab in localStorage, so every
fresh tab opened Configuration on "Plex" as if that were its home. useTabPersistedState keeps it
in sessionStorage (account-scoped): a reload and a trip to another page keep it, a new tab starts
on the first sub-tab. The pre-selects (a Review link, the Google-link return) write the same store;
a value an older build left in localStorage is cleared on first read.

frontend/src/App.tsx

@@ -16,7 +16,7 @@ import {
   type PanelLayout,
 } from "./lib/panelLayout";
 import { notify, removeByMetaKind } from "./lib/notifications";
-import { LS, setAccountRaw } from "./lib/storage";
+import { LS, setTabRaw } from "./lib/storage";
 import { usePref } from "./lib/usePref";
 import { useVerifyEntry } from "./lib/useVerifyEntry";
 import { useNavigation, useNavigationActions } from "./components/navigationContext";
@@ -249,7 +249,7 @@ export default function App() {
     if (result === "ok") {
       notify({ level: "success", message: t("settings.account.googleLink.linked") });
       void refetchMe();
-      setAccountRaw(LS.settingsTab, "account");
+      setTabRaw(LS.settingsTab, "account");
       setPage("settings");
     } else {
       const key = result === "conflict" || result === "mismatch" ? result : "error";