The remove branch already resolved the key a load would use, but the save
branch wrote payload.model_id literally. The browser normalizes casing before
storing, so a backfilled key and a later UI save left two entries for one
model; with two equivalent keys present resolve_model_override_key finds no
unique match, so any third casing resolved to no override at all and the model
silently loaded with defaults.
A standalone .gguf gets variants=() from the resolver, so variant is None and
only the bare ids were tried. The picker keys the same file by the quant label
it derives from the filename, which is never empty, so those settings lived
under <path>:LABEL and nothing reached them. Try the filename-derived key after
the variant-qualified ones and before the bare ones, so older bare entries
still work.
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