科幻取消音效

Short descending sci-fi UI cancel blip, 120 ms. Same steel-plate click family as the confirm tick, but the pitch falls about 20 percent and the 110 Hz sub-thump is softer and shorter, ending in a tiny 200 Hz filtered noise puff. Feels like a latch releasing. Dry, cold, mechanical. No reverb, no musical melody, no cinematic swell.