Operator follow-ups:
- Remove the tap-to-start wall; show a 'Loading Universe…' splash until all media
preloaded (main() awaits preloadAllMedia + a progress bar), then reveal the app.
- Both Video + Audio toggles default OFF (black + silent at start).
- FIX audio still silent on real Safari: the A/B-crossfade-after-gesture didn't
unlock on Safari (priming srcless elements doesn't unlock them). Use ONE <audio>
element played SYNCHRONOUSLY inside the toggle's click — the reliable Safari
unlock; later altitude swaps reuse the unlocked element.
- First time Video turns on, also turn Audio on (one flip = full experience), set+
played in the same gesture; Audio-on-first stays audio-only.
- Soundtrack follows Altitude via the single element (brief fade swap).
- Verified in headless Chromium AND WebKit: coupling works, soundtrack plays,
video-off blanks, zero JS errors. 290 tests + 5 Playwright E2E pass.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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