- Add support for new ComfyUI node types in gallery metadata extraction:
- CFGGuider for CFG scale values
- BasicScheduler for steps parameter
- KSamplerSelect for sampler selection
- RandomNoise/SeedHistory for seed values
- Update both main gallery (/gallery) and metadata viewer (/metadata.html)
- Fix metadata display issues where technical parameters showed as "Unknown"
- Add comprehensive test image and debug tools for validation
- Maintain backward compatibility with legacy KSampler nodes
This resolves metadata parsing issues with modern ComfyUI workflows
that use the newer node architecture for sampling and generation.
