refactor(animations): converge P1 motion durations to ≤300ms target

- 151 scripted + 1 manual duration fixes across 46 files
- framer entrance 0.5/0.6s -> 0.3s
- Tailwind hover -> duration-150, entrance -> duration-300
- preserve flip-clock/page-transition per semantic decision
- design-system.ts dead-code deferred
- P1 violations 156 -> 5; P0 remains 0; OK class 249 -> 400
- verified: tsc clean, eslint 0 errors
- verified: 130/130 jest suites, 1573 passed
- verified: visual regression 46/46 zero-pixel diff

Co-Authored-By: 阿睿 <workbuddy@tencent.com>

src/app/(marketing)/news/news-content-v3.tsx

@@ -23,13 +23,13 @@ function NewsCard({ newsItem, index }: { newsItem: NewsItem; index: number }) {
       initial={{ opacity: 0, y: 20 }}
       whileInView={{ opacity: 1, y: 0 }}
       viewport={{ once: true, margin: '-80px' }}
-      transition={{ duration: 0.5, delay: index * 0.08, ease: EASE_OUT }}
+      transition={{ duration: 0.3, delay: index * 0.08, ease: EASE_OUT }}
     >
       <StaticLink
         href={`/news/${newsItem.id}`}
-        className="group relative block border border-border-primary hover:border-brand/30 bg-white transition-all duration-500 hover:-translate-y-2 overflow-hidden h-full"
+        className="group relative block border border-border-primary hover:border-brand/30 bg-white transition-all duration-150 hover:-translate-y-2 overflow-hidden h-full"
       >
-        <div className="absolute top-0 left-0 bottom-0 w-1 bg-brand scale-y-0 group-hover:scale-y-100 transition-transform duration-500 origin-top" />
+        <div className="absolute top-0 left-0 bottom-0 w-1 bg-brand scale-y-0 group-hover:scale-y-100 transition-transform duration-150 origin-top" />
 
         {newsItem.image && !imageError ? (
           <div className="aspect-video bg-bg-secondary overflow-hidden">
@@ -37,7 +37,7 @@ function NewsCard({ newsItem, index }: { newsItem: NewsItem; index: number }) {
               src={newsItem.image}
               alt={newsItem.title}
               onError={() => setImageError(true)}
-              className="w-full h-full object-cover group-hover:scale-105 transition-transform duration-700"
+              className="w-full h-full object-cover group-hover:scale-105 transition-transform duration-150"
             />
           </div>
         ) : (