fix: splitting text ui broken (#1848)

web/app/components/datasets/create/step-two/index.module.css

   font-size: 13px;
   line-height: 18px;
 }
+
 .input {
   @apply inline-flex h-9 w-full py-1 px-2 rounded-lg text-xs leading-normal;
   @apply bg-gray-100 caret-primary-600 hover:bg-gray-100 focus:ring-1 focus:ring-inset focus:ring-gray-200 focus-visible:outline-none focus:bg-white placeholder:text-gray-400;
 .fileIcon.json {
   background-image: url(../assets/json.svg);
 }
+
 .sourceContent {
   flex: 1 1 auto;
 }
+
 .sourceCount {
   @apply shrink-0 ml-1;
   font-weight: 500;
   line-height: 18px;
   color: #667085;
 }
+
 .segmentCount {
   flex: 1 1 30%;
   max-width: 120px;
 
 .previewWrap {
   flex-shrink: 0;
+  width: 524px;
+}
+
+.previewWrap.isMobile {
   max-width: 524px;
 }
 
   backdrop-filter: blur(4px);
   animation: fix 0.5s;
 }
+
 @keyframes fix {
   from {
     padding-top: 42px;
     font-size: 18px;
     line-height: 28px;
   }
+
   to {
     padding-top: 12px;
     font-size: 12px;
     line-height: 18px;
   }
-}
+}

web/app/components/datasets/create/step-two/index.tsx

         </div>
       </div>
       <FloatRightContainer isMobile={isMobile} isOpen={showPreview} onClose={hidePreview} footer={null}>
-        {showPreview && <div ref={previewScrollRef} className={cn(s.previewWrap, 'relative h-full overflow-y-scroll border-l border-[#F2F4F7]')}>
+        {showPreview && <div ref={previewScrollRef} className={cn(s.previewWrap, isMobile && s.isMobile, 'relative h-full overflow-y-scroll border-l border-[#F2F4F7]')}>
           <div className={cn(s.previewHeader, previewScrolled && `${s.fixed} pb-3`)}>
             <div className='flex items-center justify-between px-8'>
               <div className='grow flex items-center'>