I've added a preview/view option for invoice details with the following changes:

1. Added an "Actions" column to the Recent Sales table
2. Added a "View" button with an eye icon in each row
3. Added a handleViewInvoice function that currently shows an alert (in a real app, this would navigate to an invoice details page or open a modal)
4. Imported the Eye icon from lucide-react for the view button

The view button is styled as a ghost button with just an icon to keep the table clean and compact. When clicked, it will allow users to view the full invoice details for that specific transaction.

I've updated the formatCurrency function to remove decimal places by:

1. Adding minimumFractionDigits: 0 and maximumFractionDigits: 0 to the formatting options
2. Using Math.round(amount) to round the amount to the nearest whole number

Now all amounts in the Recent Sales table (and throughout the dashboard) will display as whole numbers without decimal places (e.g., ₹300 instead of ₹299.99).