refactor(ui, navigation): implement platform-specific routing and redesign components

- Added platform detection logic `currentPlatform()` in `PlatformType.js.kt`.
- Introduced platform-based behavior for LandingScreen, Dashboard, and Login flow.
- Replaced Row with FlowRow in PingScreen to improve button layout.
- Updated Meldestelle Dashboard with platform-specific headers and authentication checks.
- Adjusted AppHeader to accept `isAuthenticated` and `username` parameters.

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

frontend/features/ping-feature/build.gradle.kts

@@ -28,6 +28,7 @@ kotlin {
       implementation(projects.frontend.core.designSystem)
       implementation(projects.frontend.core.sync)
       implementation(projects.frontend.core.localDb)
+      implementation(projects.frontend.core.auth) // Added auth module for AuthTokenManager
       implementation(libs.sqldelight.coroutines)
       implementation(projects.frontend.core.domain)
 
@@ -43,6 +44,7 @@ kotlin {
       implementation(libs.bundles.compose.common)
 
       implementation(libs.koin.core)
+      implementation(libs.koin.compose) // Added koin.compose for koinInject
     }
 
     commonTest.dependencies {

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

@@ -133,9 +133,11 @@ private fun StatusBadge(text: String, color: Color) {
 @Composable
 private fun ActionToolbar(viewModel: PingViewModel) {
   // Wrap buttons to avoid overflow on small screens
-  Row(
+  @OptIn(ExperimentalLayoutApi::class)
+  FlowRow(
     modifier = Modifier.fillMaxWidth(),
-    horizontalArrangement = Arrangement.spacedBy(Dimens.SpacingXS)
+    horizontalArrangement = Arrangement.spacedBy(Dimens.SpacingXS),
+    verticalArrangement = Arrangement.spacedBy(Dimens.SpacingXS)
   ) {
     DenseButton(text = "Simple", onClick = { viewModel.performSimplePing() })
     DenseButton(text = "Enhanced", onClick = { viewModel.performEnhancedPing() })