- New core/api_call_tracker.py — centralized tracker with rolling 60s
timestamps (speedometer) and 24h minute-bucketed history (charts)
- Instrument all 9 service client rate_limited decorators to record
actual API calls with per-endpoint tracking for Spotify
- 1-second WebSocket push loop for real-time gauge updates
- Modern radial arc gauges with service brand colors, glowing active
arc, endpoint dot, 0/max scale labels, smooth CSS transitions
- Click any gauge to open detail modal with 24h call history chart
(Canvas 2D, HiDPI, gradient fill, grid lines, danger zone band)
- Spotify modal shows per-endpoint history lines with color legend
and live per-endpoint breakdown bars
- Rate limited state indicator — blinking red badge with countdown
timer appears on gauge card when Spotify ban is active
- REST endpoint GET /api/rate-monitor/history/<service> for chart data
- Responsive grid layout (5 cols desktop, 3 tablet, 2 phone)
- Add get_artist_top_tracks to Last.fm client (up to 100 tracks)
- Include lastfm_listeners, lastfm_playcount, lastfm_tags, lastfm_bio,
and soul_id in artist detail API response
- New endpoint: /api/artist/<id>/lastfm-top-tracks for lazy loading
- Hero layout: image (160px) | center (name, badges, genres, bio,
listener/play stats, progress bars) | right card (scrollable top
100 tracks from Last.fm)
- Badges 36px with hover lift, bio in subtle card with Read More
toggle, Last.fm tags merged with existing genres
- Numbers formatted: 1234567 → 1.2M
- Graceful degradation: sections hidden when Last.fm data unavailable
