Implement Gift Rating Feature for Present Picker App

Description: We need to add a new feature to our Present Picker app that allows users to rate the gift suggestions they receive. This will enhance user engagement and provide valuable feedback on the quality of our gift recommendations.

Feature Details:

• Add a rating box below the chat interface
• Users can rate the last suggested gift on a scale of 1 to 5 stars
• The rating box should have a semi-transparent dark background to match the existing UI style
• Display a confirmation message with the user's rating

Implementation Steps:

1. Install the required package: st-star-rating
2. Import the necessary module in app.py: from streamlit_star_rating import st_star_rating
3. Create a new function add_rating_box() to handle the rating feature
4. Modify the main() function to include the new rating box
5. Style the rating box to match the app's existing design
6. Test the feature to ensure it works correctly and doesn't interfere with existing functionality

Technical Notes:

• Use the st-star-rating package for the star rating component
• Ensure the rating box is responsive and works on different screen sizes
• Consider storing ratings for future analysis (optional, could be a follow-up task)

Acceptance Criteria:

• Users can see a rating box below the chat interface
• Users can select a rating from 1 to 5 stars
• The app displays a confirmation message with the selected rating
• The rating box matches the app's overall design and theme
• The feature works without breaking existing functionality

Estimated Effort: Medium

Priority: Medium