studio: sort OOM GGUF variants smallest-to-largest

OOM variants are more useful sorted ascending by size since smaller ones
are more likely to run with --fit. Non-OOM variants remain largest-first
(best quality).

studio/frontend/src/components/assistant-ui/model-selector/pickers.tsx

@@ -225,7 +225,8 @@ function GgufVariantExpander({
       const bOom = gpuGb != null && gpuGb > 0 && bGb > 0 && checkVramFit(bGb, gpuGb) === "exceeds";
       if (aOom !== bOom) return aOom ? 1 : -1;
 
-      return b.size_bytes - a.size_bytes;
+      // Non-OOM: largest first (best quality); OOM: smallest first (most likely to fit)
+      return aOom ? a.size_bytes - b.size_bytes : b.size_bytes - a.size_bytes;
     });
   }, [variants, effectiveRecommended, gpuGb]);