Add hub order popup modal with compact instance trade embed (plan A).

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

manual_trading_hub/static/app.css

@@ -2526,6 +2526,69 @@ button.btn-sm {
   gap: 8px;
 }
 
+.order-popup-modal .order-popup-card {
+  width: min(920px, calc(100vw - 24px));
+  max-height: calc(100vh - 32px);
+  display: flex;
+  flex-direction: column;
+  padding: 0;
+  overflow: hidden;
+}
+
+.order-popup-head {
+  padding: 12px 14px;
+  border-bottom: 1px solid var(--border-soft);
+  flex-shrink: 0;
+}
+
+.order-popup-head-actions {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+}
+
+.order-popup-frame-wrap {
+  position: relative;
+  flex: 1;
+  min-height: 420px;
+  max-height: calc(100vh - 120px);
+  background: #0b0d14;
+}
+
+.order-popup-frame {
+  width: 100%;
+  height: 100%;
+  min-height: 420px;
+  border: 0;
+  display: block;
+  background: #0b0d14;
+}
+
+.order-popup-loading {
+  position: absolute;
+  inset: 0;
+  display: none;
+  align-items: center;
+  justify-content: center;
+  gap: 10px;
+  color: var(--muted);
+  font-size: 13px;
+  background: rgba(8, 10, 18, 0.82);
+  z-index: 2;
+}
+
+.order-popup-modal.is-loading .order-popup-loading {
+  display: flex;
+}
+
+.order-popup-modal.is-loading .order-popup-frame {
+  opacity: 0.35;
+}
+
+body.hub-order-popup-open {
+  overflow: hidden;
+}
+
 .table-scroll {
   overflow-x: auto;
   -webkit-overflow-scrolling: touch;