Adaptive card on the Dashboard showing library state with four modes:
- No server: gold accent, directs to Settings
- Disconnected: gold warning with troubleshooting guidance
- Empty library: blue accent with prominent Scan Now button
- Healthy: green accent with stats grid (artists/albums/tracks/DB size),
Refresh button (incremental) and Deep Scan button (full re-check)
Stats displayed as mini cards with individual icons. Animated glow orb,
gradient accent top line, shimmer progress bar during scans. Deep scan
added to /api/database/update endpoint (deep_scan flag) — re-checks
every track, adds new ones, removes stale, preserves enrichment data.
Confirmation dialog explains what deep scan does before starting.
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