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Create a responsive admin dashboard for a fintech application.
Requirements:
- Left Sidebar: Collapsible navigation with icons (Home, Transactions, Reports, Settings).
- Top Bar: Search bar, Notification bell, and User Profile dropdown.
- Main Area:
- Top row: 4 Metric Cards (Total Balance, Expenses, Income, Savings) with sparklines.
- Middle row: A large area chart for "Revenue over time".
- Bottom row: A data table showing recent transactions with status badges (Success, Pending, Failed).