From UAT: glass reads strongest where there's content behind it, so split the
look into two tiers instead of one global compromise.
- index.css: global :root defaults are now the 'Adaptive' baseline (solid-enough
dark glass for content-less chrome). New .glass-media scope class carries the
UAT-tuned translucent values (blur 10 / surface 50% / card 60% / scrim 30% /
edge 25%) for surfaces that float over real artwork.
- Apply .glass-media to the art-backed Plex detail views (PlexInfo page variant,
PlexShowView, PlexSeasonView) and drop PlexInfo's hard-coded inline 55%
overrides so those panels are scope-driven and consistent (hero no longer
reads solid while the season strips are translucent).
- Two new colour schemes: Starship (deep-space blue, azure accent) and Matrix
(near-black, phosphor green), each with dark+light tokens + swatches.
- Remove the thumbnail-mosaic backdrop (did nothing usefully; its home is the
future 'videos behind glass' phase) — deletes MosaicBackdrop, mosaic vars/CSS,
and the tuner's mosaic controls. GlassTuner presets resynced to the new
baseline (Current / Media / Max-readable).
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