Three user-flagged fixes:
1. Cardiac sounds library expanded from 3 to 7 (from Wikimedia Commons
heart-sounds + heart-murmurs subcategories). All real recordings:
- Normal (61 bpm) [existing]
- Infant heartbeat [new — pediatric reference]
- VSD [existing]
- Mitral valve prolapse [existing]
- Still's murmur in a toddler [new — classic innocent murmur]
- Functional murmur (adult female) [new — benign flow murmur]
- PVCs [new — arrhythmia]
All with native <audio controls> (play/pause/seek/elapsed/total
work on desktop AND mobile for free).
2. APTM diagram is now full-width on every device, no longer sharing
row space with the legend on mobile:
- Image always on its own row, max-width:420px, centered
- Wrapped in an <a href target="_blank"> — tap/click opens the PNG
full-size in a new tab where browser pinch-zoom works natively
- "Tap to open full-size" hint line under the image
- Legend below uses auto-fit minmax(min(100%,260px),1fr) so it stacks
on narrow viewports without cramping
3. Synth sounds (rhonchi, pleural rub, grunting, normal vesicular — all
Web-Audio-API generated, no native controls) now have:
- Play button → kicks off playback and hides itself
- Stop button appears, lets user terminate early
- Progress bar animates over 3.2 s, resets at end
- Only one synth sound plays at a time (clicking another stops the
previous)
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