SAN FRANCISCO — As it became clear early in the offseason that the Giants were pushing hard to upgrade at second base, there was an obvious question for the front office. Wasn’t there a far bigger hole in right field? Giants officials would respond to that question by insisting that the goal in 2026 was to focus on improving their outfield defense, and on Monday they took a big step toward getting better in that department. Veteran Harrison Bader agreed to a two-year, $20.5 million contract that is pending a physical, a source confirmed to NBC Sports Bay Area. The deal first was reported by The Athletic’s Ken Rosenthal.Bader, 31, is not a middle-of-the-order bat and never has been an All-Star, but he is a good defender in center, and the Giants should benefit from the way that impacts the rest of their outfielders. The biggest gains will come if the Giants swallow hard and move Jung Hoo Lee to right, a decision they have discussed internally but had hoped to kick down the road a bit longer. That would benefit the team but also Lee, who ranked in the 91st percentile last year in arm strength but was worth negative-five Outs Above Average...