China stocks seesawed in thin trading volume on Wednesday as many urban workers left ahead of the Lunar New Year holidays and with some investors booking profits on concerns of any uncertainty when markets are closed for the festival. ** China's blue-chip CSI 300 Index slipped 0.2% and the Shanghai Composite Index ended almost flat. ** Hong Kong's Hang Seng Index and the Hang Seng China Enterprises Index edged up 0.5% and 0.4%, respectively. ** Millions of urban workers were on the move across China on Wednesday ahead of the expected Friday peak of its Lunar New Year mass migration,...