remove accidentally committed file

Error events from the WS server were silently swallowed — the onError
handler was empty and provider_error didn't trigger endCall. Now:
errors display in the overlay subtitle and loadError banner, and
provider_error is treated as terminal (ends the call).

app/src/main/java/dev/kaizen/app/chat/ChatScreenViewModel.kt

@@ -1087,7 +1087,7 @@ class ChatScreenViewModel(
 
             svc.onError = { code, message ->
                 viewModelScope.launch {
-                    // error handled by LiveCallOverlay
+                    loadError = message ?: code
                 }
             }
 

app/src/main/java/dev/kaizen/app/live/LiveCallService.kt

@@ -228,8 +228,9 @@ class LiveCallService : Service() {
             }
 
             is ServerEvent.Error -> {
+                _subtitle.value = event.message ?: event.code
                 onError?.invoke(event.code, event.message)
-                if (event.code in setOf("auth_failed", "restricted_model", "restricted_feature", "budget_exceeded", "concurrent_limit")) {
+                if (event.code in setOf("auth_failed", "restricted_model", "restricted_feature", "budget_exceeded", "concurrent_limit", "provider_error")) {
                     endCall()
                 }
             }