Show rating prompt after share sheet is dismissed

iOS: moved registerSuccessfulExport() into onDismiss so it fires
after the share sheet closes, not while it is still open.
Android: hold launchReview() until the activity is RESUMED so the
dialog cannot overlap the share chooser.

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

android/app/src/main/java/app/voltplan/cable/data/ReviewPrompt.kt

@@ -7,11 +7,14 @@ import androidx.datastore.preferences.core.edit
 import androidx.datastore.preferences.core.intPreferencesKey
 import androidx.datastore.preferences.core.longPreferencesKey
 import androidx.datastore.preferences.core.stringPreferencesKey
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleOwner
 import app.voltplan.cable.BuildConfig
 import app.voltplan.cable.analytics.Analytics
 import com.google.android.play.core.ktx.launchReview
 import com.google.android.play.core.ktx.requestReview
 import com.google.android.play.core.review.ReviewManagerFactory
+import kotlinx.coroutines.flow.filter
 import kotlinx.coroutines.flow.first
 
 /**
@@ -113,6 +116,11 @@ object ReviewPrompt {
         runCatching {
             val manager = ReviewManagerFactory.create(context)
             val reviewInfo = manager.requestReview()
+            // Wait until the activity is resumed so the dialog doesn't overlap a share sheet
+            // that was just launched (startActivity returns immediately, so we may still be paused).
+            (activity as? LifecycleOwner)?.lifecycle?.currentStateFlow
+                ?.filter { state: Lifecycle.State -> state.isAtLeast(Lifecycle.State.RESUMED) }
+                ?.first()
             manager.launchReview(activity, reviewInfo)
         }
     }