feat(frontend): per-platform Streamable HTTP input for MCP Hub import

frontend/src/pages/front/MarketPage.css

@@ -1091,6 +1091,22 @@
   border-color: var(--color-accent-light);
 }
 
+.hub-platform-wrapper {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-sm);
+}
+
+.hub-platform-code-section {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-sm);
+  padding: var(--space-md);
+  background: var(--color-bg-secondary);
+  border: 1px solid var(--color-border-light);
+  border-radius: var(--radius-md);
+}
+
 .hub-platform-header {
   display: flex;
   align-items: center;
@@ -1713,3 +1729,13 @@
   border-radius: var(--radius-md);
   border: 1px solid var(--color-border-light);
 }
+
+.hub-platform-code-section {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-sm);
+  padding: var(--space-md);
+  background: var(--color-bg-secondary);
+  border: 1px solid var(--color-border-light);
+  border-radius: var(--radius-md);
+}