The preload fetched each clip with the default HTTP cache, so a clip re-baked
under the same path (e.g. the cosmos base re-sourced to the Webb Cosmic Cliffs
flythrough) kept showing stale footage after a reload — worst case forever, when
a pre-`no-cache` build had pinned it `immutable, max-age=1y` (a plain reload never
revalidates an immutable entry). Fetch the preload with `cache: "reload"`, which
bypasses the HTTP cache, pulls fresh bytes, and updates the cache entry; the
in-memory blob cache still gives instant in-session altitude swaps. One fetch per
(re)load, so no steady-state cost.
269 passed, 2 skipped. app.js syntax-checked.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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