TURIN, Italy — Ukrainian band Kalush Orchestra won the Eurovision Song Contest, a clear show of popular support for the group’s war-ravaged nation that went beyond music. The band and its song “Stefania” beat 24 other performers early Sunday in the grand final of the competition. The public vote from home, via text message or the Eurovision app, proved decisive, lifting them above British TikTok star Sam Ryder, who led after the national juries in 40 countries cast their votes. Ukrainian President Volodymyr Zelenskyy welcomed the victory, Ukraine’s third since its 2003 Eurovision debut.