The Models page, the folder counts, search and lookups only matched
.safetensors, .ckpt and .pt in lower case, so quantized GGUF models and
most upscalers never showed. One list, MODEL_EXTENSIONS, and
is_model_file() now decide what a model file is everywhere.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>