First release candidate of the 1.4.0 series, focusing on stability and bug fixes ahead of the final stable release. This version resolves critical crashes, improves stacking reliability, and enhances Python integration for script developers.

• Fixed multiple critical crashes (seqstarnet, clearstar with Dynamic PSF, noise weights with overlap normalization)
• Fixed XTrans sensor debayering issues introduced in beta4 and Bayer pattern interpretation after background extraction
• Fixed Drizzle registration with compression enabled and global registration reference image handling
• Improved stacking rejection algorithm to properly discard pixels with zero weight
• Enhanced StarNet workflow using descreening for better star mask integration with recomposition tool
• Fixed OIII extraction normalization strategy between B and G pixels for better color balance
• Improved Python API with new SirilInterface methods (save_image_to_file, prefix arg for set_seq_frame_pixeldata)
• Fixed various RGB composition, curves preview, and deconvolution issues
• Enabled compiler optimizations through function inlining for improved performance
• Added support for arbitrary script categories in preferences tree view