Foundation for the app-wide glass-consistency epic:
- index.css: every look-driving value (blur/saturate/dark-brightness/panel-card-
menu opacity/border/inset/edge/scrim/ambient + mosaic) is now a CSS custom
property defaulting to the historical hard-coded value — one-place tunable, no
visual change until a value is bumped.
- GlassTuner.tsx: dev-only (localhost-gated) always-on corner panel that live-
drives those vars, with treatment presets (Adaptive/Gradient+/Edge+scrim),
per-scheme palette editor, muted thumbnail-mosaic toggle, localStorage persist,
and Copy-CSS export. Deleted once the tuned finals are baked in.
- MosaicBackdrop.tsx: opt-in muted (blur+darken+desaturate) mosaic of on-screen
thumbnails so dark glass has real content to refract.
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