桌面应用图标替换为 B-brackets 设计（深藏青 + 白/蓝花括号）

- icon.svg 取自 opsx-icon-options/api/B-brackets.svg，全套光栅重生成：
  icon.icns（iconutil）、icon.ico（PNG-in-ICO 6 尺寸）、16-1024 PNG、Windows Square*/StoreLogo
- 替换 Tauri 脚手架默认五角星图标；GUI 重启实测 Dock 图标已生效
- 服务全量重启：server 8787（官网/文档 200）+ web 5173 + 桌面 GUI

packages/ui/src/components/editors/ResponsePanel.tsx

@@ -4,6 +4,7 @@
 import { useMemo } from "react";
 import { useWorkspace } from "../../workspaceStore";
 import { CopyButton, JsonView, cx, formatBytes } from "../common";
+import { ProxyErrorBanner } from "../ProxyErrorBanner";
 
 export function ResponsePanel({ nodeId }: { nodeId: string }) {
   const runtime = useWorkspace((s) => s.runtime[nodeId]);
@@ -57,9 +58,11 @@ export function ResponsePanel({ nodeId }: { nodeId: string }) {
         <div className="flex items-center gap-3 pr-1 text-xs">
           {result ? (
             <>
-              <span>
-                状态{" "}
-                <b className={result.status < 400 ? "ops-success" : "ops-danger"}>{result.status}</b>
+              <span className={cx(
+                "ops-status-pill",
+                result.status >= 500 ? "ops-status-5xx" : result.status >= 400 ? "ops-status-4xx" : result.status >= 300 ? "ops-status-3xx" : "ops-status-2xx",
+              )}>
+                {result.status}
               </span>
               <span className="ops-dim">
                 耗时 <b>{result.timeMs} ms</b>
@@ -83,12 +86,10 @@ export function ResponsePanel({ nodeId }: { nodeId: string }) {
       <div className="ops-scroll min-h-0 flex-1 p-3">
         {loading && <div className="ops-dim animate-pulse py-6 text-center text-sm">请求发送中…</div>}
         {!loading && error && (
-          <div
-            className="ops-msg ops-msg-err mb-3 !font-sans text-[13px]"
-            style={{ whiteSpace: "pre-wrap" }}
-          >
-            {error}
-          </div>
+          <ProxyErrorBanner
+            message={error}
+            onDismiss={() => setRuntime(nodeId, { error: null })}
+          />
         )}
         {!loading && !error && !result && (
           <div className="ops-faint grid h-full place-items-center text-sm">