By Marek Strzelecki and Fedja Grulovic PRZEMYSL, Poland/ISACCEA, Romania (Reuters) -Ukraine’s neighbours reported a dip in numbers of refugees on Saturday as governments and volunteers struggled to find shelter for the nearly 2.6 million mostly women and children who have fled since Russia’s invasion two weeks ago. Arrivals were still building on an influx that is overwhelming volunteers, non-governmental organisations and authorities in eastern Europe’s border communities as well as the big cities to which most of the refugees head. Poland’s Border Guard said 76,200 people arrived on Friday -…