(Reuters) -Roku on Thursday forecast that its revenue growth will slow further in the fourth quarter, overshadowing its first operating profit since 2021 and sending shares down over 5% after the bell. The company expects revenue growth of 12% for the current quarter, below the 14% reported in the third quarter and the 15% growth in the second quarter. The streaming platform, whose stock has risen over 34% so far this year, also sees a slowdown in growth at its platform segment — which includes ad sales ...