Preview/dev tooling that assigns a free port via $PORT (because the
project's usual 5173 is taken) had no way to make Vite actually bind
there — Vite ignores PORT by default and falls back to its own
auto-increment, so the dev server would come up on a different port
than the one the tooling proxied to.
Adds vite-plugin-pwa with a generated manifest, icon set derived from
the Stalwart mark (192/512/maskable/apple-touch), and theme-color meta
tags. /api and /jmap are excluded from the service worker's navigate
fallback and are never precached or runtime-cached, so authenticated
mail data can't end up in Cache Storage.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Same-origin proxying to localhost:8080 avoids CORS without weakening the server's CORS policy; pair with VITE_API_BASE_URL= (empty) in .env.development.local.
Steven RYDELL