Asian shares and the euro gained on Friday as investors took heart from strength in recently volatile Chinese markets, and after Greece’s offer of a new reform plan raised hopes of a deal at a weekend summit of European leaders. The luster was expected to rub off on European shares, with financial spreadbetters expecting Britain’s FTSE 100 to open up as much as 0.8 percent, Germany’s DAX 2.1 percent higher, and France’s CAC 40 is seen opening up 1.8 percent.