PlotClassificationHistogramNode
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Overview
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Creates a stacked histogram of contour areas by predicted class.

Inputs
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- Crops Directory (String)
- Bins (Int)
- Min Area (Int)
- Max Area (Int)
- Output Dir (String)
- Filename Prefix (String)

Parameters
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- Bins: min 1, max 200, default 20. Number of histogram bins
- Min Area: min 0, max 10_000_000, default 0 (auto). Lower bound for contour area filter
- Max Area: min 0, max 10_000_000, default 0 (auto). Upper bound for contour area filter
- Output Dir: directory where the histogram image is saved
- Filename Prefix: prefix used for the saved histogram file name

Outputs
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- Histogram Image (ColorImage)
- Saved Path (String)
- Status (String)

Example
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Run ClassificationNode first, then plot the class histogram from its crops.