feat(openapi): complete upload preview and UI evidence

apps/ui/css/openapi-import.css

@@ -87,20 +87,6 @@
   font-weight: 600;
 }
 
-#openapi-import-document {
-  min-height: 132px;
-  max-height: 34vh;
-  resize: vertical;
-  padding: 14px;
-  border: 1px solid var(--border);
-  border-radius: 14px;
-  background: #0d1117;
-  color: var(--text-primary);
-  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
-  font-size: 12px;
-  line-height: 1.55;
-}
-
 #openapi-import-file {
   position: absolute;
   width: 1px;
@@ -154,6 +140,20 @@
   color: var(--red);
 }
 
+.openapi-import-status:focus-visible,
+.openapi-file-button:focus-visible {
+  outline: 2px solid var(--accent);
+  outline-offset: 3px;
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .openapi-import-modal,
+  .openapi-import-dialog {
+    scroll-behavior: auto;
+    transition: none;
+  }
+}
+
 .openapi-import-preview {
   display: grid;
   gap: 16px;