AFTER A STUNNING run during the pandemic, which put a premium on all things digital, tech stocks have hit a rough patch. The NASDAQ, a technology-heavy index, has fallen by 15% from its peak in November, weighed down by a new outbreak of covid-19 in China and the Russia-Ukraine war, which are gumming up supply chains, and inflation, which erodes the value of future cashflows, making risky growth stocks less attractive to investors. On April…