New subscriptions: Like ($0.25, does nothing), HD Audio (removes
low-pass filter from synth), Recently Played (shows current song),
Cancellation Processing ($4.99 to unsubscribe).
Polish: welcome banner fades out smoothly, exit ad plays an
annoying jingle via Tone.js, 64kbps Suffering Quality badge
shown when HD Audio not purchased, favicon added.
Moved og-card.svg source to tools/ (not needed in public/).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
