Auto-size hub order popup iframe so trade form shows without scrollbars.

Co-authored-by: Cursor <cursoragent@cursor.com>

manual_trading_hub/static/app.css

@@ -2527,8 +2527,9 @@ button.btn-sm {
 }
 
 .order-popup-modal .order-popup-card {
-  width: min(920px, calc(100vw - 24px));
-  max-height: calc(100vh - 32px);
+  width: min(980px, calc(100vw - 20px));
+  max-width: none;
+  max-height: calc(100vh - 20px);
   display: flex;
   flex-direction: column;
   padding: 0;
@@ -2536,7 +2537,7 @@ button.btn-sm {
 }
 
 .order-popup-head {
-  padding: 12px 14px;
+  padding: 10px 14px;
   border-bottom: 1px solid var(--border-soft);
   flex-shrink: 0;
 }
@@ -2549,19 +2550,21 @@ button.btn-sm {
 
 .order-popup-frame-wrap {
   position: relative;
-  flex: 1;
-  min-height: 420px;
-  max-height: calc(100vh - 120px);
+  flex: 0 0 auto;
+  width: 100%;
+  min-height: 0;
+  overflow: hidden;
   background: #0b0d14;
 }
 
 .order-popup-frame {
   width: 100%;
-  height: 100%;
-  min-height: 420px;
+  height: 520px;
+  min-height: 0;
   border: 0;
   display: block;
   background: #0b0d14;
+  overflow: hidden;
 }
 
 .order-popup-loading {