273 small changes for better calibration plots#278
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The `polars.qcut` function was found to produce inconsistently sorted string-based intervals across different versions of the `polars` library. This caused incorrect ordering of deciles in the calibration curve plot. This commit replaces the `qcut` implementation with a more robust, manual calculation using the `rank()` window function. The new logic, `((rank - 1) * n_bins // N) + 1`, correctly and consistently assigns items to their respective deciles, ensuring the calibration curve is plotted correctly regardless of the `polars` version.
…8663597 Fix: Replace unstable `qcut` with robust rank-based decile calculation
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