fix: upgrade to nextjs 16 (#888)

* Upgrade to nextjs 16

* Update sentry config

* Force dynamic for health route

* Upgrade eslint config

* Upgrade jest

* Move types to dev dependencies

* Remove pages from tailwind config

* Replace img with next image

www/proxy.ts

@@ -0,0 +1,46 @@
+import { withAuth } from "next-auth/middleware";
+import { featureEnabled } from "./app/lib/features";
+import { NextResponse } from "next/server";
+import { PROTECTED_PAGES } from "./app/lib/auth";
+
+export const config = {
+  matcher: [
+    "/((?!api|_next/static|_next/image|favicon.ico|sitemap.xml|robots.txt).*)",
+
+    // must be a copy of LOGIN_REQUIRED_PAGES
+    // cannot use anything dynamic (...LOGIN_REQUIRED_PAGES, or .concat(LOGIN_REQUIRED_PAGES))
+    // as per https://nextjs.org/docs/messages/invalid-page-config
+    "/",
+    "/transcripts(.*)",
+    "/browse(.*)",
+    "/rooms(.*)",
+  ],
+};
+
+export default withAuth(
+  async function middleware(request) {
+    const pathname = request.nextUrl.pathname;
+
+    // feature-flags protected paths
+    if (
+      (!featureEnabled("browse") && pathname.startsWith("/browse")) ||
+      (!featureEnabled("rooms") && pathname.startsWith("/rooms"))
+    ) {
+      return NextResponse.redirect(request.nextUrl.origin);
+    }
+  },
+  {
+    callbacks: {
+      async authorized({ req, token }) {
+        if (
+          featureEnabled("requireLogin") &&
+          PROTECTED_PAGES.test(req.nextUrl.pathname)
+        ) {
+          return !!token;
+        }
+
+        return true;
+      },
+    },
+  },
+);