When the Sierra snow melts and ski season fades into spring, Lake Tahoe’s ski resorts undergo a quiet transformation. Chairlifts that carried skiers all winter begin transporting hikers and mountain bikers to panoramic alpine viewpoints. Snow-covered runs give way to winding dirt trails through forests of pine and fir, and mountain villages that once buzzed with après-ski crowds settle into the rhythm of summer in the High Sierra. For locals, t…