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>

Cable/Loads/LoadsView.swift

@@ -219,7 +219,10 @@ struct LoadsView: View {
                 }
             )
         }
-        .sheet(item: $overviewShareItem, onDismiss: cleanupOverviewShareItem) { item in
+        .sheet(item: $overviewShareItem, onDismiss: {
+            cleanupOverviewShareItem()
+            ReviewPrompt.registerSuccessfulExport()
+        }) { item in
             ShareSheet(items: item.shareItems)
         }
         .alert(
@@ -1133,7 +1136,6 @@ struct LoadsView: View {
                 await MainActor.run {
                     overviewShareItem = OverviewShareItem(shareItems: [url], tempURL: url)
                     isExportingOverview = false
-                    ReviewPrompt.registerSuccessfulExport()
                 }
             } catch {
                 await MainActor.run {
@@ -1163,7 +1165,6 @@ struct LoadsView: View {
                         "system": snapshot.systemName,
                     ])
                     overviewShareItem = OverviewShareItem(shareItems: [url], tempURL: url)
-                    ReviewPrompt.registerSuccessfulExport()
                 } else {
                     overviewExportError = OverviewExportError(
                         message: String(localized: "overview.share.diagram.error", defaultValue: "Could not generate diagram. Check your internet connection.")

Cable/Systems/SystemBillOfMaterialsView.swift

@@ -301,7 +301,10 @@ struct SystemBillOfMaterialsView: View {
             }
         }
         .accessibilityIdentifier("system-bom-view")
-        .sheet(item: $activeShareItem, onDismiss: cleanupShareItem) { item in
+        .sheet(item: $activeShareItem, onDismiss: {
+            cleanupShareItem()
+            ReviewPrompt.registerSuccessfulExport()
+        }) { item in
             ShareSheet(items: [item.url])
         }
         .alert(item: $exportError) { error in
@@ -346,7 +349,6 @@ struct SystemBillOfMaterialsView: View {
                 )
                 await MainActor.run {
                     activeShareItem = ExportedPDFShareItem(url: url)
-                    ReviewPrompt.registerSuccessfulExport()
                 }
             } catch {
                 await MainActor.run {