fix(tradein): контраст AA follow-up — muted-on-tint, rating, sold-delta (#834) (#842)

Co-authored-by: bot-frontend <bot-frontend@gendsgn.local>
Co-committed-by: bot-frontend <bot-frontend@gendsgn.local>

tradein-mvp/frontend/src/components/trade-in/RecentSoldList.tsx

@@ -52,7 +52,7 @@ export function RecentSoldList({ items }: Props) {
                 it.discount_pct != null && it.discount_pct !== 0;
               const discountColor =
                 it.discount_pct != null && it.discount_pct > 0
-                  ? "#16a34a"
+                  ? "#15803d" /* #834 a11y: было #16a34a (3.3:1) → AA 5.0:1 на белом */
                   : "var(--muted, #6b7280)";
 
               return (

tradein-mvp/frontend/src/components/trade-in/trade-in.css

@@ -12,7 +12,7 @@
       /* ink */
       --fg:        oklch(18% 0.012 250);
       --fg-2:      oklch(32% 0.014 250);
-      --muted:     oklch(50% 0.012 250);
+      --muted:     #5f6570; /* #834 a11y follow-up: oklch(50%)≈#6b7280 (3.96 на тонир. KPI-фонах) → ≥4.8:1 на #fee2e2/#dbeafe тинтах */
       --muted-2:   #676d73; /* #834 a11y: было oklch(62%)=#82878c (3.6:1) → AA ≥4.65:1 на белом/off-white */
       /* lines */
       --border:    oklch(92% 0.005 250);
@@ -1620,7 +1620,7 @@
 
 .house-info-card__rating strong {
   font-size: 24px;
-  color: #f59e0b;
+  color: #b45309; /* #834 a11y: было #f59e0b (2.14:1) → AA large-text 5.0:1 на белом */
 }
 
 .house-info-card__rating-label {