fix: wrap browser opening in withContext(Dispatchers.IO) for JVM OIDC callback

Ensures proper threading for desktop actions, preventing potential blocking issues during browser invocation.

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

frontend/core/auth/src/jvmMain/kotlin/at/mocode/frontend/core/auth/data/OidcCallback.jvm.kt

@@ -2,7 +2,10 @@ package at.mocode.frontend.core.auth.data
 
 import com.sun.net.httpserver.HttpServer
 import kotlinx.coroutines.CompletableDeferred
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
 import kotlinx.coroutines.withTimeoutOrNull
+import java.awt.Desktop
 import java.net.InetSocketAddress
 import java.net.URI
 
@@ -59,7 +62,9 @@ actual suspend fun launchOidcFlow(
 
   // Browser öffnen
   try {
-    java.awt.Desktop.getDesktop().browse(URI(authUrl))
+    withContext(Dispatchers.IO) {
+      Desktop.getDesktop().browse(URI(authUrl))
+    }
   } catch (e: Exception) {
     server.stop(0)
     return OidcCallbackResult.Error("browser_error", "Browser konnte nicht geöffnet werden: ${e.message}")