Last summer, TikTok appeared to be on the ropes. The company lost its CEO. Rivals were swooping in. And the Trump administration looked determined to drive it out of business. Now, the viral video-sharing app seems to have rebounded. This month, TikTok announced an expanded partnership with Universal Music Group, accessing all of its music catalogue, a blow to its archrival, L.A.-based Triller. The company, which has a large presence in Culver City, continues to generate buzzworthy pop culture trends; for example, what began as videos suggesting songs for a musical about the popular Pixar movi…