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/ChatCardMine/index.vue

@@ -2,7 +2,7 @@
   <!-- 外层行容器：接收来自父组件的对齐类（如 flex flex-justify-end） -->
   <div class="chat-mine-row">
     <div class="chat-mine bg-17294E">
-      <span class="font-size-15 color-white">{{ text }}</span>
+      <span class="font-size-15 text-white">{{ text }}</span>
       <slot></slot>
     </div>
   </div>