feat: add shopping cart functionality

[evgongora]

Description

Closes #18

This PR adds shopping cart functionality to the application, focusing on key implementations:

Shopping Cart Page (shopping-cart/page.tsx):

Display Cart Items: Shows a list of items in the cart with images, names, quantities, and total prices.
Item Removal: Allows users to remove items using a trash icon. A DeleteConfirmationModal prompts for confirmation before deletion.
Total Price Calculation: Computes and displays the total price of all items in the cart.
Buy Button: Includes a "Buy" button for users to proceed with purchasing the items.

Cart State Management (store/cartAtom.ts):

Jotai Atoms: Utilizes Jotai for state management of cart items.
Persistent Storage: Uses atomWithStorage to persist cart data in local storage under the key "shopping-cart-storage".
Atoms Defined:
cartItemsAtom: Stores the array of cart items.
addItemAtom: Adds items to the cart or updates quantity if the item already exists.
removeItemAtom: Removes items from the cart.
clearCartAtom: Clears all items from the cart.

Header Component Update (Header.tsx):

Cart Icon with Item Count: Updates the Header component to display a cart icon showing the total number of items.
Props Modification: Adds showCart and cartItemsCount props to conditionally display the cart icon and item count.
State Access: Retrieves cart items using useAtomValue(cartItemsAtom) to calculate the total quantity.
This enhancement provides users with the ability to add products to a shopping cart, view and manage their cart contents, and proceed to purchase, significantly improving the user experience.

Checklist

• [x ] The title of the PR is clear and descriptive.
• All tests have been run and passed.
• Code follows project conventions (Biome formatting, linting).
• [] Documentation has been updated as needed.
• Commit messages follow the Conventional Commits style.

Type of Change

• Bugfix
• Feature
• Refactor
• Chore
• Documentation
• Test

Additional Notes

This is how it looks:

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