feat: 优化页面布局

Author: yibiner

src/App.css

@@ -4,4 +4,27 @@ body {
 
 table td {
   word-break: break-all;
+}
+
+/* Gentle UI polish (no layout restructuring) */
+.app-action-row .ui.button,
+.app-action-row .ui.dropdown {
+  /* reduce visual "jump" between controls */
+  margin: 0 !important;
+}
+
+.app-action-row {
+  margin-bottom: 10px;
+}
+
+.app-textarea textarea,
+.app-textarea {
+  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
+  font-size: 12px;
+  line-height: 1.45;
+}
+
+.app-textarea--source textarea,
+.app-textarea--source {
+  font-size: 13px;
 }