PWA setup with vite-plugin-pwa

[zealsprince]

The web app is a plain Vite build today (3544c1a): no manifest, no service worker. The spec commits to vite-plugin-pwa wrapping Workbox, so there's no custom service worker to maintain: autoUpdate registration, the manifest (name, icons, standalone display), and app shell precaching.

Spec

• Clients - the config block

Acceptance criteria

• The web app passes installability checks and installs on desktop and Android
• The installed app opens standalone with the manifest identity
• Repeat visits load the shell from the service worker cache
• A new deploy activates on next launch without a manual cache clear

Blocked by nothing.