Expense Tracker

Build a personal expense tracking application:

## Transaction Management
- Add expense: amount, category, date, note, receipt photo
- Quick-add with preset categories (Food, Transport, Shopping, Bills, Entertainment)
- Recurring expenses (rent, subscriptions)
- Edit and delete transactions
- Search and filter by date range, category, amount

## Categories
- Pre-built categories with icons and colors
- Custom category creation
- Category spending limits with alerts

## Dashboard
- Monthly spending overview (total, daily average)
- Category breakdown donut chart
- Spending trend line chart (last 6 months)
- Budget vs actual comparison bars
- Top spending categories this month

## Budgets
- Set monthly budget (overall and per-category)
- Progress bars showing spent vs budget
- Notifications when approaching limits (80%, 100%)
- Budget rollover option

## Reports
- Monthly/yearly spending reports
- Export to CSV
- Year-over-year comparison
- Category spending trends

Design: Friendly and clean. Green for income, red for expenses. Card-based layout. Smooth animations on data updates. Mobile-first design.