fix(feedback): preserve currentActivity in onActivityPaused when dialog is showing

onActivityPaused always fires before onActivityDestroyed. Without this
fix, currentActivity was set to null in onPause, making the cleanup
condition in onActivityDestroyed (activity == currentActivity) always
false. This left isDialogShowing permanently stuck as true, disabling
shake-to-feedback for the rest of the session.

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

Author: antonis

sentry-android-core/src/main/java/io/sentry/android/core/FeedbackShakeIntegration.java

@@ -76,7 +76,13 @@ public void onActivityPaused(final @NotNull Activity activity) {
     // would kill shake detection for the new activity.
     if (activity == currentActivity) {
       stopShakeDetection();
-      currentActivity = null;
+      // Keep currentActivity set when a dialog is showing so onActivityDestroyed
+      // can still match and clean up. Otherwise the cleanup condition
+      // (activity == currentActivity) would always be false since onPause fires
+      // before onDestroy.
+      if (!isDialogShowing) {
+        currentActivity = null;
+      }
     }
   }