feat : add multiple selection option in item master

[Gadha2311]

Added a Select button in the item list to enable multiple item selection. When the Select button is clicked, checkboxes appear beside each item, allowing users to choose multiple items at once. After selecting the desired items, an option appears to select an invoice type — either Sales Invoice or Purchase Invoice. Upon choosing the invoice type, the system redirects to the corresponding invoice page, and the selected items are automatically added to the cart.