Two years ago I attended a picturesque outdoor wedding in August where the hot and humid weather had guests occasionally ducking into their cars to enjoy a blast of AC. Dyson’s new $99.99 handheld fan would have provided some much-needed relief then, although I’m not sure I would have been comfortable powering it up during the service or reception. The HushJet Mini Cool is as slim and sleek as Dyson’s recent thin vacuum and hair dryer , but it’s not quiet enough to earn the name “Hush.” That’s unfortunate because the HushJet Mini Cool is yet another product Dyson has redesigned to look and perform better than what’s already on the market. All of its components — including the motor, 5,000mAh rechargeable battery, and spinning blades — are safely contained inside a cylindrical body 38mm in diameter that’s easy to slip into a pocket.…