refactor(templates): use pio.to_image() for relational heatmap PNG ex… #413
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…port Remove matplotlib workaround that recreated plots and use Plotly's native image export instead. This simplifies the code while maintaining output quality and fixing font size consistency between PNG and HTML. - Remove get_plotly_colorscale_as_matplotlib() and create_matplotlib_heatmap_matching_plotly() functions - Add direct PNG export using pio.to_image() with proper scale factor - Update template_utils._save_single_object() to handle raw image bytes - Replace test suite with comprehensive integration tests - Fix font size inconsistency between PNG and HTML outputs - Reduce code complexity by ~30% (200 lines → 140 lines) The refactored implementation uses kaleido for headless PNG generation, which works correctly in Galaxy's headless environment.
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Summary
This PR refactors the relational heatmap template to use Plotly's native image export instead of the matplotlib workaround.
Changes
Benefits
Testing
All 5 unit tests pass successfully, including:
Verified PNG outputs have correct dimensions and valid file format."