feat(frontend): Complete shadcn/ui migration with dark mode support and analytics updates.

- Convert all analytics components to use shadcn Card and semantic colors
- Update RawTransactionModal with proper shadcn styling and theme support
- Fix all remaining hardcoded colors to use CSS variables (bg-card, text-foreground, etc.)
- Ensure consistent theming across light/dark modes for all components
- Add custom tooltips with semantic colors for chart components

🤖 Generated with [Claude Code](https://claude.ai/code)

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

frontend/src/components/TransactionSkeleton.tsx

@@ -5,7 +5,7 @@ interface TransactionSkeletonProps {
 
 export default function TransactionSkeleton({
   rows = 5,
-  view = "table"
+  view = "table",
 }: TransactionSkeletonProps) {
   const skeletonRows = Array.from({ length: rows }, (_, index) => index);