style: fix style utility class inconsistencies and correct CSS syntax

Clean up style-related code across all components:
- Replace deprecated color-* classes with text-[color]/text-white equivalents
- Remove redundant border-box declarations and fix broken empty box-sizing rule
- Correct invalid rounded corner class syntax
- Standardize line-height to leading-[value] utilities
- Uniform margin and padding notation to [xxpx] format

src/pages/home/components/ChatLongAnswer/index.vue

@@ -8,7 +8,7 @@
     <!-- ✅ 滚动区域 -->
     <div class="flex-full overflow-hidden chat-scroll" scroll-y :scroll-into-div="scrollIntodivId" scroll-with-animation
       @scroll="onScroll" @touchstart="onTouchStart" @touchend="onTouchEnd" @touchcancel="onTouchEnd">
-      <div class="flex flex-col pt-12 px-12 pb-24 border-box gap-10">
+      <div class="flex flex-col pt-12 px-12 pb-24  gap-10">
         <div v-if="headerSections.title || headerSections.tag" class="long-answer-header">
           <div v-if="headerSections.title" class="long-answer-title">
             {{ headerSections.title.contentValue }}