add task solution - #4222

Review Summary

Your stopwatch implementation successfully meets all requirements. The keyframes correctly use from/to with transform: rotate() as specified, BEM naming is properly applied throughout (block stopwatch, elements __minutes/__seconds/__center, modifier --speed-up), and all dimensions, colors, and animation timings match the specifications exactly. The minutes hand uses steps(60) for stepped movement over 3600s, the seconds hand uses linear animation for 60s, and the speed-up modifier correctly changes durations to 10s and 600s. The stopwatch is properly centered with flexbox and includes all required classes for testing. No critical issues were found - your implementation is ready.

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