feat(frontend): Improve System page and TransactionsTable UX.

System page improvements:
- Add View Logs button to each sync operation with modal dialog
- Implement responsive design for mobile devices
- Remove redundant error count indicators
- Show full transaction text on mobile ("X new transactions")

TransactionsTable improvements:
- Use display_name instead of name • institution_id format
- Show only clean account display names in transaction rows

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

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

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

@@ -0,0 +1,21 @@
+import * as React from "react";
+import { cn } from "../../lib/utils";
+
+const ScrollArea = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement>
+>(({ className, children, ...props }, ref) => (
+  <div
+    ref={ref}
+    className={cn(
+      "relative overflow-auto scrollbar-thin scrollbar-thumb-gray-300 scrollbar-track-gray-100",
+      className
+    )}
+    {...props}
+  >
+    {children}
+  </div>
+));
+ScrollArea.displayName = "ScrollArea";
+
+export { ScrollArea };