Implement Add Book Feature with Validation and Confirmation

[Farviz14]

• Added a form to allow users to add new books with fields for title, author, ISBN, genre, available copies, and an image upload.
• Integrated front-end validations to ensure all fields are filled and ISBN meets the required format.
• Set up back-end validations to check for unique titles and ISBNs, with alerts for any validation errors.
• Implemented a confirmation alert to prompt the user before adding a book, shown only after successful validations.
• Enhanced image upload preview to allow users to view the image before submission.

This pull request introduces the complete functionality for adding books with robust validation checks and a smooth user experience. Ready for review and merge.

[guyidk]

LGTM, proceed to merge

[wei69]

LGTM PROCESS TO MERGE