Add visual polish and micro-interactions for editorial feel

Phase 1 - Critical Fixes:
- EmptyState: warm palette, coral button, Playfair Display title
- Pagination: design system colors, coral active state
- LoadingSkeleton: warm shimmer with coral tint

Phase 2 - Signature Patterns:
- Navigation: sliding underline hover effect on links
- globals.css: increased noise texture opacity for paper feel
- RankingsView: alternating row backgrounds
- HomeView: decorative coral bar under section headings

Phase 3 - Polish:
- SchoolCard: SVG trend icons replacing unicode arrows
- RankingsView: styled metallic rank badges replacing emoji medals

Phase 4 - Micro-interactions:
- Navigation badge: pop animation when count changes
- HomeView grid: staggered entry animation for cards

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

nextjs-app/components/SchoolCard.module.css

@@ -101,9 +101,38 @@
 }
 
 .trend {
-  font-size: 1rem;
-  font-weight: bold;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 20px;
+  height: 20px;
+  border-radius: 4px;
   cursor: help;
+  transition: transform 0.2s ease;
+}
+
+.trend:hover {
+  transform: scale(1.15);
+}
+
+.trendIcon {
+  width: 12px;
+  height: 12px;
+}
+
+.trendUp {
+  color: var(--accent-teal, #2d7d7d);
+  background: rgba(45, 125, 125, 0.15);
+}
+
+.trendDown {
+  color: var(--accent-coral, #e07256);
+  background: rgba(224, 114, 86, 0.15);
+}
+
+.trendStable {
+  color: var(--text-muted, #8a847a);
+  background: rgba(138, 132, 122, 0.15);
 }
 
 .actions {