Build an Actogram Viewer for Circadian Activity with OpenCode — guided app tour

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Build a local actogram viewer in 18 steps with OpenCode: bin minute activity counts, align them to Zeitgeber time, draw a double plot with light and dark shading, keep recording gaps blank, mark onsets and export the binned table.

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See the finished app, key build checkpoints, corrections and verification before following the complete journey.

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