Two regressions from the previous fix:
1. Mobile nav still wrapped into a tall stack. The @media block was
placed BEFORE the base `.nav-btn { flex: 1; min-width: 120px }`
rule, so source-order specificity made the base rule override the
mobile one. Moved the @media block to AFTER all base nav-btn rules
so it wins on screens ≤720px.
2. Albums infinite scroll never engaged when the gallery was loaded
from cache (the common case). `getAlbumCache` returned only the
array, `setAlbumCache` discarded pagination, and the DOMContentLoad
auto-load + `refreshAlbumsSilently` both bypassed
`setupAlbumsInfiniteScroll`. Now the cache preserves `{ list, page,
pages, total }`, a new `getAlbumCacheFull` exposes it, and every
cached-render path primes pagination state and arms the observer.
Background refresh also re-arms the observer after pulling fresh
`pages`, fixing the case where the cache had a stale `pages: 1`.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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