feat(desktop, device-initialization): Tools-Menü mit Backup-Option und Reset-Funktion ergänzt

Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>

frontend/core/design-system/src/jvmMain/kotlin/at/mocode/frontend/core/designsystem/components/MsFilePicker.jvm.kt

@@ -8,9 +8,12 @@ import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
-import java.awt.FileDialog
-import java.awt.Frame
 import java.io.File
+import java.nio.file.Files
+import java.nio.file.Path
+import javax.swing.JFileChooser
+import javax.swing.SwingUtilities
+import javax.swing.filechooser.FileNameExtensionFilter
 
 @Composable
 actual fun MsFilePicker(
@@ -23,17 +26,35 @@ actual fun MsFilePicker(
   enabled: Boolean,
   modifier: Modifier
 ) {
+  val currentValue = selectedPath ?: ""
+  val (isError, errorMessage) = run {
+    if (!enabled) false to null
+    else if (currentValue.isBlank()) false to null
+    else {
+      val f = File(currentValue)
+      if (directoryOnly) {
+        val ok = f.exists() && f.isDirectory && f.canWrite()
+        (!ok) to if (!ok) "Ordner existiert nicht oder ist nicht beschreibbar" else null
+      } else {
+        val ok = (f.exists() && f.isFile && f.canWrite()) || (f.parentFile?.canWrite() == true)
+        (!ok) to if (!ok) "Datei/Ordner nicht beschreibbar" else null
+      }
+    }
+  }
+
   Row(
     modifier = modifier.fillMaxWidth(),
     verticalAlignment = Alignment.CenterVertically
   ) {
     MsTextField(
-      value = selectedPath ?: "",
-      onValueChange = { },
-      readOnly = true,
+      value = currentValue,
+      onValueChange = { newValue -> onFileSelected(newValue) },
+      readOnly = false,
       label = label,
       helpDescription = helpDescription,
       placeholder = if (directoryOnly) "Verzeichnis wählen..." else "Datei wählen...",
+      isError = isError,
+      errorMessage = errorMessage,
       modifier = Modifier.weight(1f),
       enabled = enabled,
       compact = true
@@ -43,40 +64,49 @@ actual fun MsFilePicker(
 
     MsButton(
       onClick = {
-        if (directoryOnly) {
-          // AWT FileDialog für nativen Look auch bei Verzeichnissen (Windows/Linux/macOS)
-          // unter macOS erzwingt dies die Verzeichnisauswahl. Unter Windows/Linux ist es der Standard-Dialog.
-          System.setProperty("apple.awt.fileDialogForDirectories", "true")
-          val dialog = FileDialog(null as Frame?, label, FileDialog.LOAD).apply {
-            selectedPath?.let {
-              val currentDir = File(it)
-              if (currentDir.exists()) {
-                directory = currentDir.absolutePath
+        // Einheitlich plattformübergreifend: Swing JFileChooser verwenden
+        SwingUtilities.invokeLater {
+          val chooser = JFileChooser().apply {
+            isMultiSelectionEnabled = false
+            // Initiales Verzeichnis/Pfad
+            selectedPath?.let { p ->
+              val f = File(p)
+              currentDirectory = when {
+                f.isDirectory -> f
+                f.parentFile?.isDirectory == true -> f.parentFile
+                else -> currentDirectory
+              }
+              if (!directoryOnly && f.isFile) selectedFile = f
+            }
+
+            if (directoryOnly) {
+              fileSelectionMode = JFileChooser.DIRECTORIES_ONLY
+              dialogType = JFileChooser.SAVE_DIALOG // ermöglicht "Neuer Ordner"
+            } else {
+              fileSelectionMode = JFileChooser.FILES_ONLY
+              if (fileExtensions.isNotEmpty()) {
+                fileFilter = FileNameExtensionFilter(
+                  "Erlaubte Dateien",
+                  *fileExtensions.map { it.trimStart('.') }.toTypedArray()
+                )
               }
             }
           }
-          dialog.isVisible = true
-          if (dialog.directory != null && dialog.file != null) {
-            // Bei FileDialog.LOAD unter Windows/Linux wählt man oft eine Datei im Ordner,
-            // aber wir wollen den Ordner. Wir nehmen also das Verzeichnis.
-            onFileSelected(File(dialog.directory, dialog.file).parentFile.absolutePath)
-          } else if (dialog.directory != null) {
-            onFileSelected(dialog.directory)
-          }
-          System.setProperty("apple.awt.fileDialogForDirectories", "false")
-        } else {
-          // AWT FileDialog für nativen Look bei Dateiauswahl (wie vom User gewünscht)
-          val dialog = FileDialog(null as Frame?, label, FileDialog.LOAD).apply {
-            if (fileExtensions.isNotEmpty()) {
-              setFilenameFilter { _, name ->
-                fileExtensions.any { name.lowercase().endsWith(it.lowercase()) }
+
+          val result = chooser.showDialog(null, "Auswählen")
+          if (result == JFileChooser.APPROVE_OPTION) {
+            val chosen = chooser.selectedFile
+            if (directoryOnly) {
+              if (!chosen.exists()) {
+                try {
+                  Files.createDirectories(Path.of(chosen.absolutePath))
+                } catch (_: Exception) { /* ignorieren, Validierung zeigt Fehler */ }
               }
+              onFileSelected(chosen.absolutePath)
+            } else {
+              onFileSelected(chosen.absolutePath)
             }
           }
-          dialog.isVisible = true
-          if (dialog.file != null) {
-            onFileSelected(File(dialog.directory, dialog.file).absolutePath)
-          }
         }
       },
       text = "Durchsuchen",