Keeping large chart previews and CSV exports consistent

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A user loads a year of minute candles, zooms out to see the whole period, then downloads a CSV. The file should retain the selected resolution even if the chart has to combine candles to draw that view. That requirement connects several parts of a browser export tool: the dataset, viewport, pagination loop, Cancel button and file writer. Each can make a different decision about how much data it needs. Those decisions should remain visible to the user.

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