feat: redesign Math-CS with a cinematic cosmic interface

[Inmerson]

Summary

• adds a photorealistic black-hole dashboard hero with a Pages-aware optimized asset
• introduces a restrained cosmic glass design system across the application shell and internal learning views
• gives Math I and Math II distinct blue and violet identities with accessible progress visualization
• hardens mobile layout, safe-area handling, touch targets, image fallback, focus, and reduced-motion behavior
• preserves curriculum, local progress, grading, labs, exams, formulas, and assistant boundaries

Verification

• npm run verify
• npm run build:pages
• npm --prefix server ci --include=optional
• npm --prefix server run build
• generated-site checks for /Math-CS/ paths, hero copy/reference, CSS selectors, transfer budget, and dashboard-only hero use

Detailed records:

• docs/superpowers/reports/2026-08-06-cosmic-black-hole-ui-verification.md
• docs/superpowers/reports/2026-08-06-cosmic-black-hole-ui-review.md

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