China is trying to contain outbreaks of Covid-19 during the Lunar New Year by asking its citizens to stay where they are instead of travelling home for the annual re-union dinner. Kinling Lo speaks with reporters Phoebe Zhang in Shenzhen and Qin Chen Beijing about how these controls are affecting New Year plans and the mood of locals and migrant workers, while tech reporter Masha Borak details how China's big tech companies are expanding their services and reach in an effort to help people…