[Alibaba leads HK stock gains on bets China to boost support as economic toll mounts while HSBC, lenders rise on rate outlook] Hong Kong and mainland Chinese stocks jumped on speculation Beijing will step up policy stimulus measures to support businesses as more reports showed the fallout from Covid-19 lockdowns. Banks surged on prospects of wider lending margins. The Hang Seng Index rose 0.7 per cent to 21,006.67 at the local noon trading break, the highest level since April 19. The Tech Index advanced 1.7 per cent while the Shanghai Composite Index added 1.1 per cent as the mainland financial...