Report better warning on client closed abort of load

If the client closes the connection before we finish loading the model
we abort, so lets make the log message clearer why to help users
understand this failure mode

llm/server.go

@@ -528,7 +528,7 @@ func (s *llmServer) WaitUntilRunning(ctx context.Context) error {
 	for {
 		select {
 		case <-ctx.Done():
-			slog.Info("context expired before server started")
+			slog.Warn("client connection closed before server finished loading, aborting load")
 			return fmt.Errorf("timed out waiting for llama runner to start: %w", ctx.Err())
 		case err := <-s.done:
 			msg := ""