chore: sentry and nextjs major bumps (#633)

* chore: remove nextjs-config

* build fix

* sentry update

* nextjs update

* feature flags doc

* update readme

* explicit nextjs env vars + remove feature-unrelated things and obsolete vars from config

* full config removal

* remove force-dynamic from pages

* compile fix

* restore claude-deleted tests

* no sentry backward compat

* better .env.example

* AUTHENTIK_REFRESH_TOKEN_URL not so required

* accommodate auth system to requiredLogin feature

---------

Co-authored-by: Igor Loskutov <igor.loskutoff@gmail.com>

www/instrumentation-client.ts

@@ -0,0 +1,27 @@
+// This file configures the initialization of Sentry on the client.
+// The config you add here will be used whenever a users loads a page in their browser.
+// https://docs.sentry.io/platforms/javascript/guides/nextjs/
+
+import * as Sentry from "@sentry/nextjs";
+
+const SENTRY_DSN = process.env.SENTRY_DSN;
+
+if (SENTRY_DSN) {
+  Sentry.init({
+    dsn: SENTRY_DSN,
+
+    // Adjust this value in production, or use tracesSampler for greater control
+    tracesSampleRate: 0,
+
+    // Setting this option to true will print useful information to the console while you're setting up Sentry.
+    debug: false,
+
+    replaysOnErrorSampleRate: 0.0,
+
+    // This sets the sample rate to be 10%. You may want this to be 100% while
+    // in development and sample at a lower rate in production
+    replaysSessionSampleRate: 0.0,
+  });
+}
+
+export const onRouterTransitionStart = Sentry.captureRouterTransitionStart;