fix: UI remediation Phase 1 (S0-S5) + Phase 2 Sprint 6 shadow system
Phase 1:
- S0: Fix open redirect (safeNavigate), delete AuthContext/legacy auth, encrypt API keys, gitignore .env files
- S1: Split client.ts god object into 5 modules, unify toast system, delete unused Sidebar
- S2: Add glass button variant, migrate 32 z-index to SUMI tokens, fix card dark mode
- S3: Skip nav link, aria-hidden on icons, focus-visible ring fixes, alt attrs, aria-live regions
- S4: React.memo on list items, fix key={index}, loading=lazy on images
- S5: Branded loading screen, page transitions respect reduced-motion, LikeButton micro-interaction, i18n sidebar/header
Phase 2 Sprint 6:
- Wire Tailwind shadow utilities to SUMI tokens in @theme block (fixes 50+ files)
- Define shadow-card/shadow-card-hover tokens
- Remove dark:shadow-none workarounds from card.tsx (SUMI handles per-theme shadows)
Co-authored-by: Cursor <cursoragent@cursor.com>
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