Mission/MAKIMA backdrop: solid dark plate (no horizon bleed)

The panel backdrop was rgba(11,17,36,0.62→0.85) — semi-transparent —
so the page's dusk-pink horizon at the bottom of the gradient bled
through behind the panel content, drawing the eye to the page edge
and making the background gradient stand out instead of disappearing.

Switched to a near-opaque #0a1024 → #0b1530 vertical gradient (slight
slope kept for depth) and bumped backdrop-filter to blur(20px)
saturate(80%) so any residual ambient is fully diffused. The panel
now reads as its own surface rather than a tinted overlay.

Verified: bottom-center pixel is rgb(10,20,47) — uniform deep night
across the whole panel, no pink bleed at the page bottom.

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