Leading lady Renée Zellweger and director Sharon Maguire reunited on the Tribeca Film Festival stage, celebrating the boundaries they broke together through their work on “ Bridget Jones ‘s Diary” 25 years ago. Sitting in the audience, the film’s transcendence of time was evident. The theater erupted in boisterous cheering when the title card appeared, and there were several rounds of applause during pivotal moments — including when Mark (Colin Firth) finally confronts Daniel (Hugh Grant) on