Emotion Builder

1. Fixed Apple Music search always returning the same song — now picks randomly from up to 25 results, avoiding repeats. 2. Expanded each emotion from one classical pick to a 5-genre pool (classical, jazz, hip-hop, pop, K-pop); one genre picked randomly per round. 3. Made the displayed song suggestion stable per card instead of re-rolling on every re-render. 4. Renamed button "Play Calming Music" → "Play Music". 5. Added first-launch tutorial popup + persistent "?" help button, including a note about full songs for Apple Music subscribers. 6. Playback now pauses (not stops) when leaving the entry screen, and resumes on return. 7. Added debug logs for entry screen appear/disappear. 8. Fixed a navigation flicker bug on the entry detail screen. 9. Fixed music player losing its state during that flicker — player ownership moved to a per-entry cache in JournalView.