Mood Selection and Single Song Retrieval

[sydneyrd]

Description: Mood interface that fetches one recommended song from Spotify based on mood mapping.
AC:
Frontend: Grid of 6+ moods with visual design
Frontend: Hover effects and selection animation
Backend: Mood mapping config (mood -> genre, tempo, energy values)
Backend: Spotify API integration for track search
Backend: Algorithm to select single best match
Frontend: Loading spinner during fetch
Backend: Cache recent recommendations to reduce API calls
Frontend: Display song with all metadata
Tech notes: