Offer Parakeet in the picker as English-only, hide it on phones, and explain the missing language controls

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/components/ModelPicker.tsx

@@ -158,7 +158,16 @@ export function ModelPicker({
                       disabled={disabled}
                       onChange={() => onSelect(model.id)}
                     />
-                    <span className="model-option-name">{model.displayName}</span>
+                    <span className="model-option-name">
+                      {model.displayName}
+                      {model.family === "parakeet" && (
+                        // Not Whisper (D-WS7a): say what it is good for and
+                        // what it can't do, in plain words.
+                        <span className="model-option-note">
+                          Not Whisper · English only · fast on long recordings
+                        </span>
+                      )}
+                    </span>
                     <span className="model-option-meta">
                       {isDownloaded && (
                         <span