Replace window.confirm method with custom modal

For purely aesthetic reasons the window.confirm method could be swapped out to something that fits the theme better.

• Make a new component called "Modal" / "ConfirmationModal" or something similar, following the structure of the other components in the project.
• Make sure the logic found atsrc/pages/Likes/Likes.jsx:26-31 is handled by the new component instead.
• src/components/InfoPopup/InfoPopup.jsx (seen in videoclip below) and its css module file can probably be reused to a large extent here.

https://github.com/user-attachments/assets/06703a0a-d1a3-45e6-9e2c-69d9d48bf6ec