add changelog entry

Author: chargome

CHANGELOG.md

@@ -2,6 +2,33 @@
 
 ## Unreleased
 
+### Important Changes
+
+- **feat(nextjs): Add Turbopack support for React component name annotation ([#19XXX](https://github.com/getsentry/sentry-javascript/pull/19XXX))**
+
+  We added experimental support for React component name annotation in Turbopack builds. When enabled, JSX elements
+  are annotated with `data-sentry-component`, `data-sentry-element`, and `data-sentry-source-file` attributes at build
+  time. This enables searching Replays by component name, seeing component names in breadcrumbs, and performance
+  monitoring — previously only available with webpack builds.
+
+  This feature requires Next.js 16+ and is currently behind an experimental flag:
+
+  ```js
+  // next.config.ts
+  import { withSentryConfig } from '@sentry/nextjs';
+
+  export default withSentryConfig(nextConfig, {
+    _experimental: {
+      turbopackReactComponentAnnotation: {
+        enabled: true,
+        ignoredComponents: ['Header', 'Footer'], // optional
+      },
+    },
+  });
+  ```
+
+### Other Changes
+
 - "You miss 100 percent of the chances you don't take. — Wayne Gretzky" — Michael Scott
 
 ## 10.41.0