Add separate track export mode

Sources/ContentView.swift

@@ -31,6 +31,7 @@ private struct ConversionToolView: View {
     @State private var writeReport = true
     @State private var cleanAfterExport = true
     @State private var validateAfterExport = true
+    @State private var trackMode: TonUinoExportOptions.TrackMode = .merged
     @State private var isExporting = false
 
     private var canExport: Bool {
@@ -90,6 +91,13 @@ private struct ConversionToolView: View {
 
             Spacer()
 
+            Picker("Modus", selection: $trackMode) {
+                Text("Zusammenführen").tag(TonUinoExportOptions.TrackMode.merged)
+                Text("Getrennt").tag(TonUinoExportOptions.TrackMode.separate)
+            }
+            .pickerStyle(.segmented)
+            .frame(width: 230)
+
             HStack(spacing: 12) {
                 Toggle("Überschreiben", isOn: $overwriteExisting)
                 Toggle("Bericht", isOn: $writeReport)
@@ -152,11 +160,11 @@ private struct ConversionToolView: View {
             }
             .width(64)
 
-            TableColumn("Zieldatei") { _ in
-                Text("001.mp3")
+            TableColumn("Zieldatei") { episode in
+                Text(targetFileDescription(for: episode))
                     .monospacedDigit()
             }
-            .width(82)
+            .width(108)
 
             TableColumn("Erste Quelle") { episode in
                 Text(episode.tracks.first?.source.lastPathComponent ?? "-")
@@ -233,7 +241,8 @@ private struct ConversionToolView: View {
                 outputURL: outputURL,
                 options: TonUinoExportOptions(
                     overwriteExisting: overwriteExisting,
-                    writeReport: writeReport
+                    writeReport: writeReport,
+                    trackMode: trackMode
                 )
             )
 
@@ -251,6 +260,15 @@ private struct ConversionToolView: View {
             }
         }
     }
+
+    private func targetFileDescription(for episode: EpisodePlan) -> String {
+        switch trackMode {
+        case .merged:
+            "001.mp3"
+        case .separate:
+            episode.tracks.count <= 1 ? "001.mp3" : "001...\(String(format: "%03d", episode.tracks.count)).mp3"
+        }
+    }
 }
 
 private struct SDCardToolView: View {