The dollar hit a four-year peak against a basket of currencies in early Asian trade on Monday, bolstering Japanese shares, but other Asian shares shrugged off Friday’s Wall Street rebound in the face of political unrest in Hong Kong. Hong Kong shares dropped 2.3 percent to three-month lows in the worst unrest since China took back control of the former British colony two decades ago. MSCI’s broadest index of Asia-Pacific shares outside Japan dropped 0.7 percent, hitting its lowest level since mid-May.