Cellestial 0.58.1

What's changed

Fixed

• Fixed non-aggregated heatmap(..., axis=1) plots so variable identifiers are preserved through scaling, row binning, and layout.
• Corrected row spacing and y-axis limits for non-aggregated heatmaps, including single-key heatmaps.
• Kept heatmap group separators aligned with the corrected row spacing.

Tests and documentation

• Added regression coverage for variable-axis heatmaps, scaling, binning, single-key layouts, and dendrogram rendering.
• Corrected the dendrogram_size type in the heatmap example.

No breaking changes.