style(site): square team photo frames (no border radius)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

site/assets/css/style.css

@@ -907,7 +907,7 @@ section[id] {
 .trainer-item .trainer-pic {
   width: 200px;
   height: 200px;
-  border-radius: var(--fitme-radius);
+  border-radius: 0;
   margin: 0 auto 1.5rem;
   overflow: hidden;
   position: relative;
@@ -924,7 +924,7 @@ section[id] {
   content: '';
   position: absolute;
   inset: 0;
-  border-radius: var(--fitme-radius);
+  border-radius: 0;
   background:
     radial-gradient(ellipse at 30% 20%, rgba(255, 255, 255, 0.25) 0%, transparent 50%),
     radial-gradient(ellipse at 70% 80%, rgba(255, 255, 255, 0.08) 0%, transparent 45%),