feat(front): unify all front user pages to DESIGN.md brand #5B5FED; fix decimal-rgba off-brand purples missed by hex normalization (MarketPage focus shadow, LoginPage radial glow)

frontend/src/pages/front/MarketPage.tsx

@@ -96,7 +96,7 @@ const ServerIcon = () => (
 
 // ===== Color palette for avatar icons =====
 const AVATAR_COLORS = [
-  { bg: '#EEEDFF', fg: '#6C63FF' },
+  { bg: '#EEEDFF', fg: '#5B5FED' },
   { bg: '#E6F7EE', fg: '#219B5E' },
   { bg: '#FEF4E8', fg: '#E8922C' },
   { bg: '#EBF2FE', fg: '#3B82F6' },