refactor: migrate to tailwind arbitrary width classes

remove the unused src/static/scss/width.scss file and its import from index.scss, replace all existing custom width utility class usages with the equivalent Tailwind arbitrary width syntax

src/pages/ChatModule/LongTextGuideCardPreview/index.vue

@@ -1,7 +1,7 @@
 <template>
   <view class="w-full bg-white border-ff overflow-hidden rounded-[20px] flex flex-col">
     <!-- 占位撑开 -->
-    <view class="w-vw"></view>
+    <view class="w-screen"></view>
     <view class="flex flex-col px-[16px] pt-[16px] pb-[12px] border-box" @click="openDetail(item)">
 
       <view class="long-text-guide-card__badge text-[12px] font-bold" :class="`is-${item.badgeTone}`">