Working on new GEGL ops and porting existing filters as GEGL ops

GIMP is actively migrating its legacy filter system to proper GEGL operations to enable non-destructive editing, and better PSD compatibility. This project contributes to that effort. First, an Inner Glow layer style will be implemented as a native GEGL operation. The implementation will use a distance transform on the layer's alpha channel to generate a per-pixel glow mask, with parameters including spread, size, opacity, intensity, noise, and blend modes empirically validated against Photopea for PSD compatibility. Once complete, it will be mapped to GIMP's PSD importer so that PSD files with inner glow layer styles import correctly. Second, a Bevel layer style will be implemented as a GEGL operation. Bevel is the remaining unimplemented PSD layer style in GIMP, involving multiple bevel styles, separate highlight and shadow blend modes, and depth and blur interactions. The same empirical approach will be used, systematically studying parameter outputs and implementing each feature step by step. Third, the legacy sharpen filter will be ported to a GEGL meta-operation. The existing implementation relies on the legacy GimpDrawable API with manual pixel loops and is limited to 8-bit images. Since the algorithm is a 3×3 convolution, it can be cleanly expressed as a GEGL meta-op, bringing it into the modern pipeline. Deliverables: A PSD-compatible gegl:inner-glow operation mapped to the PSD importer A PSD-compatible gegl:bevel operation mapped to the PSD importer A ported sharpen filter as a GEGL meta-operation