(SP: 2) Create a feedback modal for post-cooperation review

[dudchakk]

Description: Design and implement a modal UI that allows users to leave feedback after closing a cooperation. The modal will only handle the user interface without connecting to any backend or handling data submission.

Include:

• Header & description welcoming the user to leave a review;
• A rating component (e.g., stars or a numerical slider) for the user to rate their experience;
• A text area for the user to write their feedback;
• Cancel and Submit buttons.

Align the modal design with the theme of the project.