implement rating feature

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