By Katanga Johnson (Reuters) – World stocks traded mixed while oil prices and bond yields dipped on Tuesday as traders fretted over prospects of further central bank tightening and worries about the health of economies worldwide. The dollar’s role as the safe-haven currency for investors concerned about the economic outlook has been burnished in recent weeks, with the U.S. currency roaring to two-decade highs against multiple currencies, while the euro sank to within a whisker of parity with the dollar. The pan-European STOXX 600 index rose 0.49% and MSCI’s gauge of stocks across the globe she…