- refactor TopNavBar: replace legacy flex classes with Tailwind utilities, swap uni-icons to Vant van-icon, remove unused status bar placeholder and old SCSS classes
- overhaul ImageSwiper: replace custom swiper with Vant Swipe components, migrate all SCSS styles to inline Tailwind classes, remove unused znicons font assets and delete old stylesheet
- clean up goods page: remove unused TopNavBar import and template, remove dead navOpacity scroll logic, remove local style import
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