Add custom headers to direct connections (#2922)

* Add custom headers to direct connections

* Address custom header review feedback

* Fix direct connection header integration

* Fix desktop relay E2E transport setup

---------

Co-authored-by: Claude <claude@Claudes-Mac-mini.local>
Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

packages/app/src/i18n/resources/zh-CN.ts

@@ -1388,6 +1388,19 @@ export const zhCN: TranslationResources = {
         show: "显示高级选项",
         hide: "隐藏高级选项",
       },
+      headers: {
+        title: "自定义请求头",
+        add: "添加请求头",
+        name: "名称",
+        value: "值",
+        remove: "删除请求头",
+        errors: {
+          missingName: "请为每个请求头输入名称",
+          invalidName: "{{name}} 不是有效的请求头名称",
+          invalidValue: "{{name}} 包含无效换行符",
+          duplicateName: "{{name}} 输入了多次",
+        },
+      },
       passwordVisibility: {
         show: "显示密码",
         hide: "隐藏密码",