feat(shopping): Implement list export and improve item suggestions

Implements two new features for shopping lists:

1.  **Export to Text File:**
    - Adds an "Exportieren" option to the shopping list detail view menu.
    - Allows users to save a shopping list as a .txt file using the Storage Access Framework.
    - The exported format includes the list name, item names, quantity, and a marker for completed items (`[x]`)

2.  **Improved Item Suggestions:**
    - Suggestions now appear for any existing item in the list, not just completed ones.
    - The suggestion text now differentiates between completed items ("(erledigt)") and items already on the list ("(ist schon in der liste)")

Also includes a minor theme adjustment to set the status and navigation bar colors.

app/src/main/java/de/lxtools/noteshop/MainActivity.kt

@@ -34,7 +34,13 @@ import androidx.compose.material.icons.filled.Menu
 import androidx.compose.material.icons.filled.Search
 import androidx.compose.material.icons.filled.Visibility
 import androidx.compose.material.icons.filled.VisibilityOff
+import androidx.compose.material.icons.filled.MoreVert
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.material3.DrawerValue
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
@@ -122,6 +128,21 @@ fun AppShell(
     val shoppingListWithItems by shoppingListsViewModel.getShoppingListWithItemsStream(selectedListId ?: 0)
         .collectAsState(initial = null)
 
+    val context = LocalContext.current
+    val exportLauncher = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.CreateDocument("text/plain"),
+        onResult = { uri ->
+            uri?.let {
+                shoppingListWithItems?.let { list ->
+                    val content = shoppingListsViewModel.formatShoppingListForExport(list)
+                    context.contentResolver.openOutputStream(it)?.use { outputStream ->
+                        outputStream.write(content.toByteArray())
+                    }
+                }
+            }
+        }
+    )
+
     ModalNavigationDrawer(
         drawerState = drawerState,
         drawerContent = {
@@ -160,7 +181,7 @@ fun AppShell(
                 }
             }
         }
-    ) { 
+    ) {
         Scaffold(
             modifier = Modifier.fillMaxSize().windowInsetsPadding(WindowInsets.safeDrawing.only(WindowInsetsSides.Horizontal)),
             topBar = {
@@ -180,8 +201,8 @@ fun AppShell(
                             } else {
                                 when (currentScreen) {
                                     is Screen.ShoppingListDetail -> {
-                                        IconButton(onClick = { 
-                                            currentScreen = Screen.ShoppingLists; selectedListId = null 
+                                        IconButton(onClick = {
+                                            currentScreen = Screen.ShoppingLists; selectedListId = null
                                         }) {
                                             Icon(Icons.AutoMirrored.Filled.ArrowBack, contentDescription = stringResource(R.string.back))
                                         }
@@ -203,6 +224,27 @@ fun AppShell(
                                     Icon(Icons.Default.Add, contentDescription = stringResource(R.string.add_shopping_list))
                                 }
                             }
+                            if (currentScreen == Screen.ShoppingListDetail) {
+                                var showMenu by remember { mutableStateOf(false) }
+                                IconButton(onClick = { showMenu = !showMenu }) {
+                                    Icon(Icons.Default.MoreVert, contentDescription = "More")
+                                }
+                                DropdownMenu(
+                                    expanded = showMenu,
+                                    onDismissRequest = { showMenu = false }
+                                ) {
+                                    DropdownMenuItem(
+                                        text = { Text("Exportieren") },
+                                        onClick = {
+                                            showMenu = false
+                                            shoppingListWithItems?.let {
+                                                val fileName = "${it.shoppingList.name}.txt"
+                                                exportLauncher.launch(fileName)
+                                            }
+                                        }
+                                    )
+                                }
+                            }
                         },
                         colors = TopAppBarDefaults.topAppBarColors(
                             containerColor = Color.Transparent

app/src/main/java/de/lxtools/noteshop/ui/shopping/ShoppingListDetailScreen.kt

@@ -93,7 +93,7 @@ fun ShoppingListDetailScreen(
                 val currentSearchTerm = newItemName.substringAfterLast(',').trim()
                 val suggestions = if (currentSearchTerm.isNotBlank()) {
                     shoppingListWithItems?.items?.filter {
-                        it.name.contains(currentSearchTerm, ignoreCase = true)  && it.isChecked
+                        it.name.contains(currentSearchTerm, ignoreCase = true)
                     } ?: emptyList()
                 } else {
                     emptyList()
@@ -126,8 +126,13 @@ fun ShoppingListDetailScreen(
                                     },
                                 verticalAlignment = Alignment.CenterVertically
                             ) {
+                                val suggestionText = if (item.isChecked) {
+                                    stringResource(R.string.completed)
+                                } else {
+                                    stringResource(R.string.already_in_list)
+                                }
                                 Text(
-                                    text = item.name + " (" + stringResource(R.string.completed) + ")",
+                                    text = "${item.name} ($suggestionText)",
                                     style = MaterialTheme.typography.bodyLarge,
                                     modifier = Modifier.weight(1f)
                                 )

app/src/main/java/de/lxtools/noteshop/ui/shopping/ShoppingListsViewModel.kt

@@ -283,6 +283,17 @@ class ShoppingListsViewModel(private val noteshopRepository: NoteshopRepository)
         }
     }
 
+    fun formatShoppingListForExport(listWithItems: ShoppingListWithItems): String {
+        val builder = StringBuilder()
+        builder.appendLine(listWithItems.shoppingList.name)
+        listWithItems.items.sortedBy { it.displayOrder }.forEach { item ->
+            val checkedMarker = if (item.isChecked) "[x]" else "[ ]"
+            val quantity = if (item.quantity != null) " (${item.quantity})" else ""
+            builder.appendLine("- $checkedMarker ${item.name}$quantity")
+        }
+        return builder.toString()
+    }
+
 
     companion object {
         private const val TIMEOUT_MILLIS = 5_000L

app/src/main/java/de/lxtools/noteshop/ui/theme/Theme.kt

@@ -10,6 +10,10 @@ import androidx.compose.material3.dynamicLightColorScheme
 import androidx.compose.material3.lightColorScheme
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.runtime.SideEffect
+import androidx.compose.ui.platform.LocalView
+import androidx.compose.ui.graphics.toArgb
+import androidx.core.view.WindowCompat
 import de.lxtools.noteshop.ui.theme.BluePrimary
 
 private val DarkColorScheme = darkColorScheme(
@@ -51,6 +55,15 @@ fun NoteshopTheme(
         else -> LightColorScheme
     }
 
+    val view = LocalView.current
+    if (!view.isInEditMode) {
+        SideEffect {
+            val window = (view.context as Activity).window
+            window.statusBarColor = colorScheme.primary.toArgb()
+            window.navigationBarColor = colorScheme.background.toArgb()
+        }
+    }
+
     MaterialTheme(
         colorScheme = colorScheme,
         typography = Typography,

app/src/main/res/values-de/strings.xml

@@ -55,4 +55,5 @@
     <string name="move_item_down">Element nach unten verschieben</string>
     <string name="rename_item">Element umbenennen</string>
     <string name="set_quantity">Menge festlegen</string>
+    <string name="already_in_list">ist schon in der liste</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -55,4 +55,5 @@
     <string name="move_item_down">Move item down</string>
     <string name="rename_item">Rename item</string>
     <string name="set_quantity">Set quantity</string>
+    <string name="already_in_list">already in list</string>
 </resources>