TUNISIAN police arrested prominent opposition figure Chaima Issa during a Saturday protest in the capital, just one day after an appeals court delivered prison sentences of up to 45 years to a group of opposition leaders, businessmen, and lawyers in what human rights observers have condemned as a politically motivated show trial. The dramatic arrest—which Issa herself predicted moments before police detained her—crystallises the central role Tunisia's criminal justice system now plays in President Kais Saied's systematic suppression of political opposition, transforming what was once the Arab Spring's sole democratic success story into an increasingly authoritarian state lurching from one…