feat(frontend): Add comprehensive bank account management system.

- Add drawer-based bank account connection flow with country/bank selection
- Create bank connection success page with redirect handling
- Add bank connections status card showing all requisitions and their states
- Move account management actions to appropriate sections (add to connections, edit in accounts)
- Implement proper delete functionality for bank connections via GoCardless API
- Add proper TypeScript types for all bank-related data structures
- Improve error handling for bank connection operations with specific HTTP status codes
- Remove transaction data when disconnecting accounts while preserving history

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

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

frontend/src/components/ui/scroll-area.tsx

@@ -9,7 +9,7 @@ const ScrollArea = React.forwardRef<
     ref={ref}
     className={cn(
       "relative overflow-auto scrollbar-thin scrollbar-thumb-gray-300 scrollbar-track-gray-100",
-      className
+      className,
     )}
     {...props}
   >