feat(dashboard): default to Analytics tab; fix(test): unbreak jsdom localStorage under Node 22+

Dashboard now opens on the Analytics tab for first-time visitors (localStorage
still wins once a user picks a tab). Also unbreaks the client test suite in
this environment: Node 22+'s built-in --experimental-webstorage localStorage
stub was shadowing jsdom's working one, failing every test that touches
localStorage. Disabled via a Node-major-gated poolOptions.forks.execArgv so
Node 20/21 test runs are unaffected.

client/src/pages/Dashboard.tsx

@@ -2330,7 +2330,7 @@ export function Dashboard() {
   // Persistent Tab State
   const [activeTab, setActiveTab] = useState<"monitor" | "analytics" | "health">(() => {
     return (
-      (localStorage.getItem("dashboard_tab") as "monitor" | "analytics" | "health") || "monitor"
+      (localStorage.getItem("dashboard_tab") as "monitor" | "analytics" | "health") || "analytics"
     );
   });
 

client/vitest.config.ts

@@ -25,6 +25,14 @@ function resolveAppVersion(): string {
 }
 const APP_VERSION = resolveAppVersion();
 
+// Node >=22 ships a built-in `localStorage` global (Web Storage API) that, without
+// a configured `--localstorage-file`, is a non-functional stub (getItem/setItem
+// undefined) — it shadows jsdom's own working localStorage before the jsdom
+// environment can install it. Disabling it on those Node versions lets jsdom's
+// localStorage apply instead; the flag doesn't exist on Node 20/21, so it's
+// gated to avoid breaking test runs there.
+const nodeMajor = Number(process.versions.node.split(".")[0]);
+
 export default defineConfig({
   plugins: [react()],
   define: {
@@ -32,6 +40,14 @@ export default defineConfig({
   },
   test: {
     environment: "jsdom",
+    environmentOptions: {
+      jsdom: {
+        url: "http://localhost/",
+      },
+    },
+    ...(nodeMajor >= 22
+      ? { poolOptions: { forks: { execArgv: ["--no-experimental-webstorage"] } } }
+      : {}),
     setupFiles: ["./src/test-setup.ts"],
     include: ["src/**/*.test.{ts,tsx}"],
     css: false,