Yes your mage will be able to use any weapons that a fighter can use once he hits level 14. So as a fighter, you can grandmaster the longsword, and once you hit level 14 with your mage, your mage will then be a grandmaster with the longsword.
You mage can also wear armor that a fighter can use (platmail,etc) but he can't cast while wearing it. Your mage can also use a shield, so you can hold a nice protective shield while you cast.
It would have been better if you dual classed at level 12, the extra fighter level only gives you a Thaco drop, you get your proficiency at level 12, but its not going to hurt you any, so have fun.
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