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/ProfilePage.tsx

@@ -244,8 +244,8 @@ const ProfilePage: React.FC = () => {
   const getLevelGradient = (level: number) => {
     const gradients: Record<number, string> = {
       0: 'linear-gradient(135deg, #8B919E, #BFC4CE)',
-      2: 'linear-gradient(135deg, #5B5FED, #8B8DFF)',
-      3: 'linear-gradient(135deg, #F59E0B, #FBBF24)',
+      2: 'linear-gradient(135deg, #5B5FED, #8185F5)',
+      3: 'linear-gradient(135deg, #E8922C, #F0A94C)',
     };
     return gradients[level] || gradients[0];
   };