refactor: Improve textarea focus behavior in PlaygroundForm component

src/components/Option/Playground/PlaygroundForm.tsx

@@ -39,15 +39,26 @@ export const PlaygroundForm = ({ dropedFile }: Props) => {
     selectedKnowledge
   } = useMessageOption()
 
+  const isMobile = () => {
+    return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(
+      navigator.userAgent
+    )
+  }
+
   const textAreaFocus = () => {
     if (textareaRef.current) {
       if (
         textareaRef.current.selectionStart === textareaRef.current.selectionEnd
       ) {
+        if (!isMobile()) {
           textareaRef.current.focus()
+        } else {
+          textareaRef.current.blur()
         }
       }
     }
+  }
+
   const form = useForm({
     initialValues: {
       message: "",