fix: add skipWaiting/clientsClaim to VitePWA workbox config

Root cause: SW remained in waiting phase after redeploy, serving stale
precached assets. Without skipWaiting/clientsClaim the old SW persisted
and controlled the page even after a new SW was installed.

Fixes blank-page regression where React never mounted on login.

vite.config.ts

@@ -39,6 +39,8 @@ export default defineConfig({
         ],
       },
       workbox: {
+        skipWaiting: true,
+        clientsClaim: true,
         globPatterns: ["**/*.{js,css,html,ico,png,svg,woff2}"],
         navigateFallbackDenylist: [
           /^\/api\/auth\//,