docs: Note visionOS setCurrentScreen no-op in CHANGELOG

The migration to `SentrySDK.internal.screen.setCurrent` drops the
current-screen breadcrumb enrichment on visionOS because sentry-cocoa's
new `SentryInternalScreenApi` is gated to iOS/tvOS only. Already
documented in a code comment; call it out for downstream users too.

Flagged by Seer.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: alwx

CHANGELOG.md

@@ -8,6 +8,10 @@
 
 ## Unreleased
 
+### Changes
+
+- **visionOS:** breadcrumbs no longer include the current screen name. sentry-cocoa's new hybrid-SDK `SentryInternalScreenApi` (which replaces the deprecated `PrivateSentrySDKOnly.setCurrentScreen:`) is gated to iOS/tvOS only, so the bridge stubs the setter on visionOS. Other visionOS behaviour (frames tracking, RNSScreen swizzle) is unchanged.
+
 ### Internal
 
 - Migrate iOS code from the deprecated `PrivateSentrySDKOnly` SPI (and `SentrySwizzle.h` macro) to the new `SentrySDK.internal` Swift API exposed by sentry-cocoa 9.19.0, via a thin in-pod ObjC↔Swift bridge ([#6370](https://github.com/getsentry/sentry-react-native/issues/6370))