fix(android,ios): Fix shake detection lifecycle bugs

- iOS: Remove manual `hasListeners = YES` from `enableShakeDetection`;
  the flag is managed by `startObserving`/`stopObserving` exclusively.
  Setting it manually could cause spurious events when no JS listeners
  are registered.
- Android: `removeListeners` has no event-type context so it incorrectly
  decremented the shake counter on any listener removal (e.g. frame/log
  events), prematurely stopping shake detection. Move shake detection
  management to `enableShakeDetection`/`disableShakeDetection` which are
  explicitly called from JS and carry clear intent.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: antonis

packages/core/android/src/main/java/io/sentry/react/RNSentryModuleImpl.java

@@ -125,7 +125,6 @@ public class RNSentryModuleImpl {
 
   private static final String ON_SHAKE_EVENT = "rn_sentry_on_shake";
   private @Nullable SentryShakeDetector shakeDetector;
-  private int shakeListenerCount = 0;
 
   /** Max trace file size in bytes. */
   private long maxTraceFileSize = 5 * 1024 * 1024;
@@ -207,23 +206,15 @@ public void crash() {
   }
 
   public void addListener(String eventType) {
-    if (ON_SHAKE_EVENT.equals(eventType)) {
-      shakeListenerCount++;
-      if (shakeListenerCount == 1) {
-        startShakeDetection();
-      }
-      return;
-    }
     // Is must be defined otherwise the generated interface from TS won't be
     // fulfilled
     logger.log(SentryLevel.ERROR, "addListener of NativeEventEmitter can't be used on Android!");
   }
 
   public void removeListeners(double id) {
-    shakeListenerCount = Math.max(0, shakeListenerCount - (int) id);
-    if (shakeListenerCount == 0) {
-      stopShakeDetection();
-    }
+    // removeListeners does not carry event-type information, so it cannot be used
+    // to track shake listeners selectively. Shake detection is managed exclusively
+    // via enableShakeDetection / disableShakeDetection.
   }
 
   private void startShakeDetection() {
@@ -254,14 +245,11 @@ private void stopShakeDetection() {
   }
 
   public void enableShakeDetection() {
-    // On Android, shake detection is started via addListener. This method is a no-op
-    // because it exists to satisfy the cross-platform spec (on iOS, the NativeEventEmitter
-    // addListener does not reliably dispatch to native, so an explicit call is needed).
+    startShakeDetection();
   }
 
   public void disableShakeDetection() {
-    // On Android, shake detection is stopped via removeListeners. This method is a no-op
-    // for the same reason as enableShakeDetection.
+    stopShakeDetection();
   }
 
   public void fetchModules(Promise promise) {

packages/core/ios/RNSentry.mm

@@ -322,7 +322,6 @@ - (void)handleShakeDetected
         [shakeDetector performSelector:@selector(enable)];
 #pragma clang diagnostic pop
     }
-    hasListeners = YES;
 }
 
 RCT_EXPORT_METHOD(disableShakeDetection)