feat: implement MedicationsView with sortable table and prescribing history

- Create MedicationsView component with three category tabs (Active, Clinical, PRN)
- Implement sortable columns with visual sort indicators
- Add expandable rows showing prescribing history timeline
- Use proper semantic table markup with scope attributes
- Add fadeIn animation for expanded content
- Traffic light status dots with text labels for accessibility
- Alternating row colors and hover states (#EFF6FF)
- Respects prefers-reduced-motion preference

Task 8 of Clinical Record PMR implementation

src/index.css

@@ -66,6 +66,15 @@ body {
   animation: seedPulse 0.6s ease-in-out infinite;
 }
 
+@keyframes fadeIn {
+  from { opacity: 0; transform: translateY(-4px); }
+  to { opacity: 1; transform: translateY(0); }
+}
+
+.animate-fadeIn {
+  animation: fadeIn 200ms ease-out forwards;
+}
+
 .scrollbar-hide {
   -ms-overflow-style: none;
   scrollbar-width: none;