refactor(core, veranstaltung): Exception-Handling vereinfacht und Delay-Angabe optimiert

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

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

@@ -9,6 +9,7 @@ import kotlinx.coroutines.flow.asStateFlow
 import org.koin.core.component.KoinComponent
 import org.koin.core.component.inject
 import org.koin.core.qualifier.named
+import kotlin.time.Duration.Companion.milliseconds
 
 /**
  * Überwacht die Konnektivität zum API-Gateway.
@@ -28,7 +29,7 @@ class ConnectivityTracker : KoinComponent {
     scope.launch {
       while (isActive) {
         _isOnline.value = checkConnection()
-        delay(10_000) // Alle 10 Sekunden prüfen
+        delay(10_000.milliseconds) // Alle 10 Sekunden prüfen
       }
     }
   }
@@ -37,7 +38,7 @@ class ConnectivityTracker : KoinComponent {
     return try {
       val response = client.get(NetworkConfig.baseUrl.trimEnd('/') + "/api/ping/health")
       response.status.value in 200..299
-    } catch (e: Exception) {
+    } catch (_: Exception) {
       false
     }
   }