Fix HermesWsClientTest teardown and OkHttp 5.x deprecation warnings

- Widen catch in tearDown() from Exception to Throwable so
  MockWebServer.shutdown() AssertionError is caught (OkHttp 5.x
  enforces clean connection state on shutdown)
- Increase teardown wait from 100ms to 500ms for WS close handshake
- Replace deprecated RequestBody.create(null, ...) with
  toRequestBody() extension from Kotlin API

app/src/main/java/com/m57/hermescontrol/data/ws/HermesWsClient.kt

@@ -25,7 +25,9 @@ import kotlinx.coroutines.launch
 import okhttp3.CertificatePinner
 import okhttp3.OkHttpClient
 import okhttp3.Request
+import okhttp3.MediaType.Companion.toMediaType
 import okhttp3.RequestBody
+import okhttp3.RequestBody.Companion.toRequestBody
 import okhttp3.Response
 import okhttp3.WebSocket
 import okhttp3.WebSocketListener
@@ -166,7 +168,7 @@ object HermesWsClient {
                 Request.Builder()
                     .url("http://${AuthManager.getHost()}:${AuthManager.getPort()}/api/auth/ws-ticket")
                     .header("Cookie", "hermes_session_at=$sessionCookie")
-                    .post(RequestBody.create(null, "{}"))
+                    .post("{}".toRequestBody())
                     .build()
             val response = client.newCall(request).execute()
             if (response.isSuccessful) {

app/src/main/java/com/m57/hermescontrol/ui/authlogin/AuthLoginViewModel.kt

@@ -18,7 +18,7 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import okhttp3.OkHttpClient
 import okhttp3.Request
-import okhttp3.RequestBody
+import okhttp3.RequestBody.Companion.toRequestBody
 import java.util.concurrent.TimeUnit
 
 /**
@@ -341,7 +341,7 @@ class AuthLoginViewModel(private val app: Application) : ViewModel() {
                 Request.Builder()
                     .url("$baseUrl/auth/password-login")
                     .header("Content-Type", "application/json")
-                    .post(RequestBody.create(null, jsonBody))
+                    .post(jsonBody.toRequestBody())
                     .build()
             val loginResp = loginClient.newCall(loginReq).execute()
 
@@ -389,7 +389,7 @@ class AuthLoginViewModel(private val app: Application) : ViewModel() {
                 Request.Builder()
                     .url("$baseUrl/api/auth/ws-ticket")
                     .header("Cookie", cookieHeader)
-                    .post(RequestBody.create(null, "{}"))
+                    .post("{}".toRequestBody())
                     .build()
             val ticketResp = ticketClient.newCall(ticketReq).execute()
 

app/src/test/java/com/m57/hermescontrol/data/ws/HermesWsClientTest.kt

@@ -60,10 +60,11 @@ class HermesWsClientTest {
     fun tearDown() {
         HermesWsClient.disconnect()
         // Wait a bit to allow internal OkHttp coroutines to clean up before shutting down MockWebServer
-        Thread.sleep(100)
+        // Increased from 100ms for OkHttp 5.x — needs more time for the WS close handshake
+        Thread.sleep(500)
         try {
             mockWebServer.shutdown()
-        } catch (e: Exception) {
+        } catch (e: Throwable) {
             e.printStackTrace()
         }
         unmockkAll()