Widen settings forms and fix Token clipboard copy fallback.

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

control/frontend/src/pages/Settings.tsx

@@ -150,6 +150,39 @@ export default function SettingsPage() {
     }
   }
 
+  async function copyToken(text: string) {
+    setErr("");
+    setOk("");
+    try {
+      if (navigator.clipboard?.writeText) {
+        await navigator.clipboard.writeText(text);
+        setOk("已复制到剪贴板");
+        return;
+      }
+    } catch {
+      /* fall through to legacy copy */
+    }
+    try {
+      const ta = document.createElement("textarea");
+      ta.value = text;
+      ta.setAttribute("readonly", "");
+      ta.style.position = "fixed";
+      ta.style.left = "-9999px";
+      document.body.appendChild(ta);
+      ta.select();
+      ta.setSelectionRange(0, text.length);
+      const okCopy = document.execCommand("copy");
+      document.body.removeChild(ta);
+      if (okCopy) {
+        setOk("已复制到剪贴板");
+        return;
+      }
+    } catch {
+      /* ignore */
+    }
+    setErr("复制失败，请手动选中 Token 复制");
+  }
+
   return (
     <div>
       <h2>系统设置</h2>
@@ -297,10 +330,7 @@ export default function SettingsPage() {
               <button
                 type="button"
                 className="btn ghost"
-                onClick={() => {
-                  void navigator.clipboard.writeText(lastToken.token);
-                  setOk("已复制到剪贴板");
-                }}
+                onClick={() => void copyToken(lastToken.token)}
               >
                 复制
               </button>