fix(proxy): preserve URL query/fragment and improve error handling

Extract shared URL utilities to handle query strings and fragments correctly.
Add race condition fix for URL preview, improve proxy toggle error feedback,
and support Codex chat format proxy endpoint.

src/components/providers/forms/shared/EndpointField.tsx

@@ -1,4 +1,4 @@
-import { useState, useEffect } from "react";
+import { useState, useEffect, useRef } from "react";
 import { useTranslation } from "react-i18next";
 import { FormLabel } from "@/components/ui/form";
 import { Input } from "@/components/ui/input";
@@ -40,6 +40,7 @@ export function EndpointField({
 }: EndpointFieldProps) {
   const { t } = useTranslation();
   const [urlPreview, setUrlPreview] = useState<UrlPreview | null>(null);
+  const lastRequestIdRef = useRef(0);
 
   const defaultManageLabel = t("providerForm.manageAndTest", {
     defaultValue: "管理和测速",
@@ -54,15 +55,18 @@ export function EndpointField({
 
     // 防抖：延迟 300ms 后请求
     const timer = setTimeout(async () => {
+      const requestId = ++lastRequestIdRef.current;
       try {
         const preview = await proxyApi.buildUrlPreview(
           appType,
           value,
           apiFormat,
         );
+        if (requestId !== lastRequestIdRef.current) return;
         setUrlPreview(preview);
       } catch (error) {
         console.error("Failed to build URL preview:", error);
+        if (requestId !== lastRequestIdRef.current) return;
         setUrlPreview(null);
       }
     }, 300);

src/components/proxy/ProxyToggle.tsx

@@ -34,7 +34,7 @@ function extractBaseUrl(provider: Provider, appId: AppId): string | null {
       return typeof envUrl === "string" ? envUrl.trim() : null;
     }
 
-    if (appId === "codex") {
+    if (appId === "codex" || appId === "opencode") {
       const tomlConfig = config?.config;
       if (typeof tomlConfig === "string") {
         const match = tomlConfig.match(/base_url\s*=\s*(['"])([^'"]+)\1/);
@@ -85,16 +85,19 @@ export function ProxyToggle({
           );
 
           if (proxyRequirement) {
-            // 显示警告但仍允许关闭
+            const warningKey =
+              proxyRequirement === "openai_chat_format"
+                ? "notifications.openAIChatFormatWarningOnDisable"
+                : proxyRequirement === "url_mismatch"
+                  ? "notifications.urlMismatchWarningOnDisable"
+                  : "notifications.fullUrlWarningOnDisable";
+
             toast.warning(
-              t("notifications.fullUrlWarningOnDisable", {
+              t(warningKey, {
                 defaultValue:
-                  "当前供应商配置了完整 API 路径或特殊格式，关闭代理后可能无法正常工作。建议更换为基础地址配置或保持代理开启。",
+                  "当前供应商配置可能依赖代理模式，关闭代理后可能无法正常工作。建议更换为基础地址配置或保持代理开启。",
               }),
-              {
-                duration: 6000,
-                closeButton: true,
-              },
+              { duration: 6000, closeButton: true },
             );
           }
         } catch (error) {
@@ -107,6 +110,17 @@ export function ProxyToggle({
       await setTakeoverForApp({ appType: activeApp, enabled: checked });
     } catch (error) {
       console.error("[ProxyToggle] Toggle takeover failed:", error);
+      toast.error(
+        t("proxy.takeover.toggleFailed", {
+          defaultValue: "切换接管状态失败",
+        }),
+        {
+          description: t("proxy.takeover.toggleFailedDesc", {
+            defaultValue: "请检查代理服务状态与权限，然后重试。",
+          }),
+          closeButton: true,
+        },
+      );
     }
   };