chore(frontend): cleanup legacy code and improve localization consistency

- Removed deprecated `NotificationCard` component due to dependency on an outdated presentation layer.
- Translated comments and documentation to German for improved localization across `core.auth`, `ping-feature`, and `network`.
- Standardized comment formatting, improved doc clarity, and ensured consistent API documentation in all modules.

frontend/core/auth/src/commonMain/kotlin/at/mocode/frontend/core/auth/data/AuthApiClient.kt

@@ -44,13 +44,13 @@ class AuthApiClient(
           append("grant_type", "password")
           append("client_id", clientId)
 
-          // IMPORTANT: Only send client_secret if it's NOT a public client (like 'web-app')
+          // WICHTIG: Senden Sie client_secret nur, wenn es sich NICHT um einen öffentlichen Client (wie 'web-app') handelt.
-          // Keycloak rejects requests from public clients that contain a client_secret.
+          // Keycloak lehnt Anfragen von öffentlichen Clients ab, die client_secret enthalten.
-          // We check if the client ID suggests a public client or if secret is explicitly provided.
+          // Wir prüfen, ob die Client-ID auf einen öffentlichen Client hindeutet oder ob ein Secret explizit angegeben wurde.
-          // For now, we rely on the fact that 'web-app' is public and should NOT have a secret sent.
+          // Aktuell gehen wir davon aus, dass 'web-app' öffentlich ist und daher kein Secret gesendet werden sollte.
 
-          // Logic: If clientId is 'web-app', we force ignore the secret, or we rely on caller to pass null.
+          // Logik: Wenn clientId 'web-app' ist, ignorieren wir das Geheimnis oder verlassen uns darauf, dass der Aufrufer null übergibt.
-          // Since AppConstants might still have the secret for 'postman-client', we need to be careful.
+          // Da AppConstants möglicherweise noch das Geheimnis für 'postman-client' enthält, ist Vorsicht geboten.
 
           if (!clientSecret.isNullOrBlank() && clientId != "web-app") {
             append("client_secret", clientSecret)

frontend/core/auth/src/commonMain/kotlin/at/mocode/frontend/core/auth/data/AuthTokenManager.kt

@@ -10,7 +10,7 @@ import kotlin.io.encoding.ExperimentalEncodingApi
 import kotlin.time.ExperimentalTime
 
 /**
- * Client-side permission enumeration that mirrors server-side BerechtigungE
+ * Client-side Berechtigungsaufzählung, welche die serverseitige BerechtigungE widerspiegelt
  */
 @Serializable
 enum class Permission {
@@ -66,9 +66,9 @@ data class AuthState(
 /**
  * Secure in-memory JWT token manager
  *
- * For web clients, storing tokens in memory is the most secure approach
+ * Für Webclients ist das Speichern von Tokens im Arbeitsspeicher der sicherste Ansatz,
- * to prevent XSS attacks. The token is lost when the browser tab is closed
+ * um XSS-Angriffe zu verhindern. Das Token geht beim Schließen des Browser-Tabs verloren,
- * or refreshed, requiring re-authentication.
+ * was eine erneute Authentifizierung erforderlich macht.
  */
 @Suppress("unused")
 class AuthTokenManager {
@@ -141,38 +141,38 @@ class AuthTokenManager {
   fun getUserId(): String? = tokenPayload?.sub
 
   /**
-   * Get username from token
+   * Get username from a token
    */
   fun getUsername(): String? = tokenPayload?.username
 
   /**
-   * Get current user permissions
+   * Get current user permissions (Berechtigungen)
    */
   fun getPermissions(): List<Permission> = _authState.value.permissions
 
   /**
-   * Check if user has a specific permission
+   * Check if the user has a specific permission
    */
   fun hasPermission(permission: Permission): Boolean {
     return _authState.value.permissions.contains(permission)
   }
 
   /**
-   * Check if user has any of the specified permissions
+   * Check if the user has any of the specified permissions
    */
   fun hasAnyPermission(vararg permissions: Permission): Boolean {
     return permissions.any { _authState.value.permissions.contains(it) }
   }
 
   /**
-   * Check if user has all of the specified permissions
+   * Check if the user has all the specified permissions
    */
   fun hasAllPermissions(vararg permissions: Permission): Boolean {
     return permissions.all { _authState.value.permissions.contains(it) }
   }
 
   /**
-   * Check if user can perform read operations
+   * Check if the user can perform read operations
    */
   fun canRead(): Boolean {
     return hasAnyPermission(
@@ -184,7 +184,7 @@ class AuthTokenManager {
   }
 
   /**
-   * Check if user can perform create operations
+   * Check if the user can perform create operations
    */
   fun canCreate(): Boolean {
     return hasAnyPermission(
@@ -196,7 +196,7 @@ class AuthTokenManager {
   }
 
   /**
-   * Check if user can perform update operations
+   * Check if the user can perform update operations
    */
   fun canUpdate(): Boolean {
     return hasAnyPermission(
@@ -208,7 +208,7 @@ class AuthTokenManager {
   }
 
   /**
-   * Check if user can perform delete operations (admin-level)
+   * Check if the user can perform delete operations (admin-level)
    */
   fun canDelete(): Boolean {
     return hasAnyPermission(
@@ -220,12 +220,12 @@ class AuthTokenManager {
   }
 
   /**
-   * Check if user is admin (has delete permissions)
+   * Check if the user is admin (has deleted permissions)
    */
   fun isAdmin(): Boolean = canDelete()
 
   /**
-   * Check if token expires within specified minutes
+   * Check if the token expires within specified minutes
    */
   @OptIn(ExperimentalTime::class)
   fun isTokenExpiringSoon(minutesThreshold: Int = 5): Boolean {
@@ -238,8 +238,8 @@ class AuthTokenManager {
   }
 
   /**
-   * Parse JWT payload for basic validation and user info extraction
+   * JWT-Payload für grundlegende Validierung und Extraktion von Benutzerinformationen analysieren
-   * Note: This is for client-side info extraction only, not security validation
+   * Hinweis: Dies dient ausschließlich der clientseitigen Informationsextraktion, nicht der Sicherheitsvalidierung.
    */
   @OptIn(ExperimentalEncodingApi::class)
   private fun parseJwtPayload(token: String): JwtPayload? {
@@ -250,7 +250,7 @@ class AuthTokenManager {
       // Decode the payload (second part)
       val payloadJson = Base64.decode(parts[1]).decodeToString()
 
-      // First try to parse with standard approach
+      // First, try to parse with a standard approach
       val basicPayload = try {
         Json.decodeFromString<JwtPayload>(payloadJson)
       } catch (e: Exception) {
@@ -263,7 +263,7 @@ class AuthTokenManager {
         return basicPayload
       }
 
-      // Otherwise, extract permissions manually from JSON string
+      // Otherwise, extract permissions manually from a JSON string
       val permissions = extractPermissionsFromJson(payloadJson)
 
       // Return payload with manually extracted permissions
@@ -282,16 +282,16 @@ class AuthTokenManager {
   }
 
   /**
-   * Extract permissions array from JSON string using simple string parsing
+   * Extract permissions array from a JSON string using simple string parsing
    */
   private fun extractPermissionsFromJson(jsonString: String): List<String>? {
     return try {
       // Simple regex to find a permissions array
-      val permissionsRegex = """"permissions":\s*\[(.*?)\]""".toRegex()
+      val permissionsRegex = """"permissions":\s*\[(.*?)]""".toRegex()
       val match = permissionsRegex.find(jsonString)
 
-      match?.let {
+      match?.let { matchResult ->
-        val permissionsContent = it.groupValues[1]
+        val permissionsContent = matchResult.groupValues[1]
         if (permissionsContent.isBlank()) return emptyList()
 
         // Extract individual permission strings

frontend/core/auth/src/commonMain/kotlin/at/mocode/frontend/core/auth/di/AuthModule.kt

@@ -9,7 +9,7 @@ import org.koin.core.qualifier.named
 import org.koin.dsl.module
 
 /**
- * Koin module for core-auth: provides AuthTokenManager and binds it as TokenProvider for apiClient.
+ * Koin-Modul für core-auth: stellt AuthTokenManager bereit und bindet ihn als TokenProvider für apiClient.
  */
 val authModule = module {
   // Single in-memory token manager
@@ -26,9 +26,9 @@ val authModule = module {
   // LoginViewModel
   factory { LoginViewModel(get(), get(), get(named("apiClient"))) }
 
-  // Bridge to core network TokenProvider without adding a hard dependency there
+  // Brücke zum TokenProvider des Kernnetzwerks, ohne dort eine harte Abhängigkeit hinzuzufügen
   single<TokenProvider> {
-    // We need to capture the AuthTokenManager instance to avoid issues with 'this' context in JS
+    // Wir müssen die AuthTokenManager-Instanz erfassen, um Probleme mit dem 'this'-Kontext in JavaScript zu vermeiden.
     val tokenManager = get<AuthTokenManager>()
     object : TokenProvider {
       override fun getAccessToken(): String? {

frontend/core/design-system/src/commonMain/kotlin/at/mocode/frontend/core/designsystem/components/AppHeader.kt

@@ -35,7 +35,7 @@ fun AppHeader(
 
       // Authentication buttons
       if (isAuthenticated) {
-        // Show username with admin indicator if user has delete permissions
+        // Show username with admin indicator if user has deleted permissions
         username?.let { user ->
           val isAdmin = userPermissions.any { it.contains("DELETE") }
           Text(
@@ -55,7 +55,7 @@ fun AppHeader(
           }
         }
       } else {
-        // Show login button
+        // Show the login button
         onNavigateToLogin?.let { loginAction ->
           TextButton(
             onClick = loginAction

frontend/core/design-system/src/commonMain/kotlin/at/mocode/frontend/core/designsystem/components/NotificationCard.kt

@@ -1,5 +0,0 @@
-package at.mocode.frontend.core.designsystem.components
-
-// Legacy notification components removed due to dependency on old presentation layer.
-// Intentionally left empty as part of cleanup. You can safely delete this file
-// if no modules import it anymore.

frontend/core/design-system/src/commonMain/kotlin/at/mocode/frontend/core/designsystem/theme/AppTheme.kt

@@ -14,7 +14,7 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.sp
 
 // --- 1. Farben (Palette) ---
-// Wir definieren eine professionelle, kontrastreiche Palette.
+// wir definieren eine professionelle, kontrastreiche Palette.
 // Blau steht für Aktion/Information, Grau für Struktur.
 
 private val LightColorScheme = lightColorScheme(

frontend/core/network/src/commonMain/kotlin/at/mocode/frontend/core/network/NetworkConfig.kt

@@ -3,8 +3,8 @@ package at.mocode.frontend.core.network
 import kotlin.native.concurrent.ThreadLocal
 
 /**
- * Network configuration with sensible defaults and environment overrides.
+ * Netzwerkkonfiguration mit sinnvollen Standardeinstellungen und Umgebungseinstellungen zum Überschreiben.
- * Defaults to the local API Gateway on port 8081.
+ * Standardmäßig wird das lokale API-Gateway auf Port 8081 verwendet.
  */
 @ThreadLocal
 object NetworkConfig {

frontend/core/network/src/commonMain/kotlin/at/mocode/frontend/core/network/NetworkModule.kt

@@ -132,7 +132,7 @@ val networkModule = module {
           // [baseClient] REQUEST: .../token
           // Access to fetch at ... blocked by CORS policy
 
-          // This confirms it is a CORS issue on the Keycloak server side, or the browser side.
+          // This confirms it is a CORS issue on the Keycloak server side or the browser side.
           // The JS error `TypeError` is GONE in the latest log!
 
           // So the interceptor logic in NetworkModule might be fine, or at least not the cause of the CORS error.

frontend/features/ping-feature/src/commonMain/kotlin/at/mocode/ping/feature/data/PingApiKoinClient.kt

@@ -10,7 +10,8 @@ import io.ktor.client.call.body
 import io.ktor.client.request.get
 
 /**
- * PingApi implementation that uses a provided HttpClient (e.g., DI-provided "apiClient").
+ * PingApi-Implementierung, die einen bereitgestellten HttpClient verwendet (z. B. den per Dependency Injection
+ * bereitgestellten "apiClient").
  */
 class PingApiKoinClient(private val client: HttpClient) : PingApi {
 

frontend/features/ping-feature/src/commonMain/kotlin/at/mocode/ping/feature/data/PingEventRepositoryImpl.kt

@@ -5,21 +5,24 @@ import at.mocode.frontend.core.sync.SyncableRepository
 import at.mocode.ping.api.PingEvent
 import app.cash.sqldelight.async.coroutines.awaitAsOneOrNull
 
-// ARCH-BLUEPRINT: This repository implements the generic SyncableRepository
+/**
-// for a specific entity, bridging the gap between the sync core and the local database.
+ ** ARCH-BLUEPRINT: Dieses Repository implementiert das generische Syncable Repository
+ ** für eine bestimmte Entität und überbrückt so die Lücke zwischen dem Sync-Core und der
+ ** lokalen Datenbank.
+ */
 class PingEventRepositoryImpl(
   private val db: AppDatabase
 ) : SyncableRepository<PingEvent> {
 
-  // The `since` parameter for our sync is the ID of the last event, not a timestamp.
+  // Der `since`-Parameter für unsere Synchronisierung ist die ID des letzten Ereignisses, kein Zeitstempel.
   override suspend fun getLatestSince(): String? {
     println("PingEventRepositoryImpl: getLatestSince called - using corrected async implementation")
-      // FIX: Use .awaitAsOneOrNull() for async drivers instead of the blocking .executeAsOneOrNull()
+    // FIX: Verwenden Sie .awaitAsOneOrNull() für asynchrone Treiber anstelle des blockierenden .executeAsOneOrNull().
     return db.appDatabaseQueries.selectLatestPingEventId().awaitAsOneOrNull()
   }
 
   override suspend fun upsert(items: List<PingEvent>) {
-    // Always perform bulk operations within a transaction.
+    // Führen Sie Massenoperationen immer innerhalb einer Transaktion durch.
     db.transaction {
       items.forEach { event ->
         db.appDatabaseQueries.upsertPingEvent(

frontend/features/ping-feature/src/commonMain/kotlin/at/mocode/ping/feature/di/PingFeatureModule.kt

@@ -11,19 +11,18 @@ import org.koin.core.qualifier.named
 import org.koin.dsl.module
 
 /**
- * Consolidated Koin module for the Ping Feature (Clean Architecture).
+ * Konsolidiertes Koin-Modul für die Ping-Funktion (Clean Architecture).
- * Replaces the old 'clients.pingfeature' module.
  */
 val pingFeatureModule = module {
   // 1. API Client (Data Layer)
-  // Uses the shared authenticated 'apiClient' from Core Network
+  // Verwendet den gemeinsam genutzten, authentifizierten „apiClient“ aus dem Kernnetzwerk.
   single<PingApi> { PingApiKoinClient(get(named("apiClient"))) }
 
   // 2. Repository (Data Layer)
   single { PingEventRepositoryImpl(get<AppDatabase>()) }
 
   // 3. Domain Service (Domain Layer)
-  // Wraps SyncManager and Repository to decouple ViewModel from SyncManager implementation details
+  // Wraps SyncManager und Repository, um ViewModel von den Implementierungsdetails von SyncManager zu entkoppeln.
   single<PingSyncService> {
     PingSyncServiceImpl(
       syncManager = get(),
@@ -32,7 +31,7 @@ val pingFeatureModule = module {
   }
 
   // 4. ViewModel (Presentation Layer)
-  // Injects API and Domain Service
+  // Injects API und Domain Service
   factory {
     PingViewModel(
       apiClient = get(),

frontend/features/ping-feature/src/commonMain/kotlin/at/mocode/ping/feature/domain/PingSyncService.kt

@@ -5,14 +5,14 @@ import at.mocode.frontend.core.sync.SyncableRepository
 import at.mocode.ping.api.PingEvent
 
 /**
- * Interface for the Ping Sync Service to allow easier testing and decoupling.
+ * Interface für den Ping-Sync-Dienst zur einfacheren Prüfung und Entkopplung.
  */
 interface PingSyncService {
   suspend fun syncPings()
 }
 
 /**
- * Implementation of PingSyncService using the generic SyncManager.
+ * Implementierung des PingSyncService unter Verwendung des generischen SyncManager.
  */
 class PingSyncServiceImpl(
   private val syncManager: SyncManager,

frontend/features/ping-feature/src/commonMain/kotlin/at/mocode/ping/feature/presentation/PingScreen.kt

@@ -19,8 +19,6 @@ import at.mocode.frontend.core.designsystem.components.DashboardCard
 import at.mocode.frontend.core.designsystem.components.DenseButton
 import at.mocode.frontend.core.designsystem.theme.Dimens
 
-// --- Refactored PingScreen using Design System ---
-
 @Composable
 fun PingScreen(
   viewModel: PingViewModel,

frontend/features/ping-feature/src/commonTest/kotlin/at/mocode/ping/feature/data/PingApiKoinClientTest.kt

@@ -15,7 +15,7 @@ import kotlin.test.assertEquals
 
 class PingApiKoinClientTest {
 
-  // Helper to create a testable client using the new DI-friendly implementation
+  // Hilfe zur Erstellung eines testbaren Clients mithilfe der neuen DI-freundlichen Implementierung
   private fun createTestClient(mockEngine: MockEngine): PingApiKoinClient {
     val client = HttpClient(mockEngine) {
       install(ContentNegotiation) {