fix: increase decoration grid row gap for images that overflow cell bounds

rowGap 36→52 (40px visual gap between image rows), columnGap separate at 28.
The 52×52 buttons have 8px image overflow on each side so row gap needed to
account for 8+visual+8 = actual gap. Previous 36→20px visual was still tight.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/features/settings/account/ProfileDecoration.tsx

@@ -250,7 +250,8 @@ export function ProfileDecoration() {
                 style={{
                   display: 'flex',
                   flexWrap: 'wrap',
-                  gap: 36,
+                  columnGap: 28,
+                  rowGap: 52,
                   paddingBottom: INSET,
                   paddingLeft: INSET,
                   paddingRight: INSET,