fix(cli): prevent auto-submit on Enter when navigating to first shell autocomplete suggestion

When using shell autocomplete, pressing Down then Up returns the activeSuggestionIndex to 0. If the first suggestion happened to be an exact match, the InputPrompt would bypass the normal autocomplete logic and eagerly submit the prompt on Enter because it ignored whether the user had actively navigated.

This fix updates the isPerfectMatch check to require that the user has not navigated the suggestions list, ensuring that explicitly selected items always autocomplete instead of submitting.

packages/cli/src/ui/components/InputPrompt.tsx

@@ -900,7 +900,9 @@ export const InputPrompt: React.FC<InputPromptProps> = ({
         completion.isPerfectMatch &&
         keyMatchers[Command.SUBMIT](key) &&
         recentUnsafePasteTime === null &&
-        (!completion.showSuggestions || completion.activeSuggestionIndex <= 0)
+        (!completion.showSuggestions ||
+          (completion.activeSuggestionIndex <= 0 &&
+            !hasUserNavigatedSuggestions.current))
       ) {
         handleSubmit(buffer.text);
         return true;