It’s safe to say Michael Morse is a hit after his first week of games at AT&T Park. His third-time-around walk-up music has Giants fans reaching for the high notes in A-ha’s 1985 hit “Take On Me.” His .350 batting average and co-team-leading 10 RBIs entering Tuesday’s series opener against the Los Angeles Dodgers haven’t hurt, either. Michael Morse so far has been the offensive upgrade in left field sought by the Giants, who signed him to a one-year, $6 million deal. Michael Morse