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需在视频模板中使用，不能单独运行。

Traffic lights, a centred file name and a monospace body whose lines (`.ln1`…) can be revealed in turn — for scattered notes or an exported CSV, as the problem or the result. Options: x, y, w, h, name, lines. Runs inside a HyperFrames video template's engine (the `HF` helpers `el` and `tl`, as in ui-walkthrough-launch).

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