Fix checkpoint regressions: jsdom localStorage shim (Node 22 shadowing) + restore persistent nav links required by §7 one-tap emergency reachability

vitest.config.ts

@@ -5,6 +5,7 @@ export default defineConfig({
     globals: false,
     include: ["tests/**/*.test.ts"],
     environment: "node",
+    setupFiles: ["./tests/setup.ts"],
     reporters: ["verbose"],
     coverage: {
       enabled: false,