SEATTLE — The Storm finalized a deal with Tina Charles and is adding the eight-time WNBA All-Star center for the second half of the season as the team ramps up for a playoff push. On Saturday, Charles mutually agreed to a ‘contract divorce’ from the Phoenix Mercury and settled on a buyout on her one-year deal worth a reported $108,000. Hours later, several reports linked the 2012 WNBA MVP to the Storm before their 85-77 upset loss to the Los Angeles Sparks. And Monday, Seattle made it official. “We are excited to add one of the premier players in our league to our roster,” coach Noelle Quinn s…