Preflight batch output destinations

internal/app/app.go

@@ -334,20 +334,19 @@ func RunBatchDetailed(ctx context.Context, req BatchRequest) (*BatchResult, erro
 	if err != nil {
 		return nil, err
 	}
+	if err := prepareBatchOutputs(req.OutputDir, plannedReports); err != nil {
+		return nil, err
+	}
 	if req.Batch == BatchEvening || req.Batch == BatchMorning {
 		startedAt := now
 		result := &BatchResult{Batch: req.Batch, StartedAt: startedAt}
 		for _, planned := range plannedReports {
 			resolved := planned.Resolved
 			item := batchReportResult(planned)
-			outputPath, err := plannedBatchOutputPath(req.OutputDir, planned)
-			if err != nil {
-				return nil, err
-			}
 			reportResult, err := generatePromptReport(ctx, promptReportRequest{
 				GenerateRequest: GenerateRequest{
 					Config:     req.Config,
-					OutputPath: outputPath,
+					OutputPath: planned.OutputPath,
 					Notifier:   req.Notifier,
 					Executor:   req.Executor,
 				},
@@ -451,6 +450,17 @@ func plannedBatchOutputPath(outputDir string, planned plannedBatchReport) (strin
 	return validateOutputPath(filepath.Join(outputDir, outputName))
 }
 
+func prepareBatchOutputs(outputDir string, plannedReports []plannedBatchReport) error {
+	for index := range plannedReports {
+		outputPath, err := plannedBatchOutputPath(outputDir, plannedReports[index])
+		if err != nil {
+			return err
+		}
+		plannedReports[index].OutputPath = outputPath
+	}
+	return nil
+}
+
 func resolveReportOutputPath(workingDir, override string, resolved report.Resolved) (string, error) {
 	outputName, err := resolved.OutputName()
 	if err != nil {