The previous datalist-on-input approach was fragile — Safari hid the
suggestions, and there was no visual cue that a dropdown existed.
Replace with a proper Select populated from the catalog. Each option
shows the per-1M-token rates inline so operators see cost while
choosing. "Custom…" switches to free-text for models the catalog
doesn't know about, with a "Catalog" button to flip back.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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