diff --git a/.github/RELEASE_TEMPLATE.md b/.github/RELEASE_TEMPLATE.md
index e34fefc..c1973e5 100644
--- a/.github/RELEASE_TEMPLATE.md
+++ b/.github/RELEASE_TEMPLATE.md
@@ -7,7 +7,8 @@
 - 设置页新增「自动更新」和「测试计划」：默认自动检查正式版，开启测试计划后可接收 RC，关闭自动更新时仍可手动检查正式版。
 - 按已保存的通道选择已发布 Release，并核对版本和更新资产；正式版通道不会提示 RC。
 - 下载和安装仍需在版本提示中由用户点击「确认更新」，检查时只获取版本清单。
-- 已安装旧版使用固定的正式版地址，需从 Releases 手动安装本版一次，之后才能选择测试计划。
+- RC 发布列表扫描设置总超时；模型添加、测试、预览、应用与恢复经过隔离验收。
+- `rc.2` 及更早版本使用固定的正式版地址，需从 Releases 手动安装支持测试计划的版本；已开启测试计划的 `rc.3` 可在应用内升级到本版。
 
 ### 下载选择
 
@@ -28,7 +29,7 @@
 - 当前安装包未使用开发者证书签名或 Apple 公证，系统可能提示未知发布者或阻止首次打开。请先确认下载来源并核对校验值。
 - Windows 需要 WebView2 Runtime；MSI 可引导安装，ZIP 需要预先安装。ZIP 仍将数据保存在当前用户应用目录，不能视为数据随身携带的便携版，也不保证注册 `power-switch://` 协议。
 - Linux AppImage 需赋予执行权限；部分发行版还需要 FUSE。DEB/RPM 会声明所需的系统依赖。
-- 此 RC 预发布不会进入正式版 Latest 更新通道。支持「测试计划」的客户端启用该选项后可收到 RC 提示；旧版客户端仍需从 Releases 手动安装一次。
+- 此 RC 预发布不会进入正式版 Latest 更新通道。支持「测试计划」的客户端启用该选项后可收到 RC 提示；`rc.2` 及更早版本需从 Releases 手动安装一次。
 - 检查更新只读取版本清单，下载安装需要在应用内再次确认。
 - 云端构建与测试通过不代表所有平台均完成真实机器安装验收。
 
diff --git a/README.md b/README.md
index a2a99f8..c7bfaa3 100644
--- a/README.md
+++ b/README.md
@@ -63,9 +63,9 @@ WorkBuddy 写入成功后可以打开新建任务页，请在 WorkBuddy 中手
 
 恢复前会再次备份当前配置，避免误操作后无法返回。
 
-## 设置配置文件位置
+## 设置配置位置
 
-在“设置”中可以修改各 Agent 的配置文件位置。默认位置如下：
+在“设置”中可以修改 WorkBuddy、Claude Code 的配置文件位置和 Codex 的配置目录。默认位置如下：
 
 | Agent       | 默认位置                              |
 | ----------- | ------------------------------------- |
diff --git a/docs/new-api.md b/docs/new-api.md
index 78d0038..72cd262 100644
--- a/docs/new-api.md
+++ b/docs/new-api.md
@@ -6,7 +6,7 @@ power-switch 内置 New API 接入模块，默认地址为 `https://new-api.banm
 
 1. 可先点击应用顶栏的 **新手指引**，通过三步动画了解申请密钥、模型入库和应用到 Agent 的流程。随后在模型库点击橙色 **从 New API 添加**。实例地址应为 HTTPS 根地址，不包含 `/v1`，且与 New API 的 `ServerAddress` 一致。
 2. 点击 **钉钉 / Keycloak 登录**，在独立窗口完成授权。应用不会读取或保存钉钉密码。
-3. 选择目前客户端、平台名称和模型。接口固定使用 `default` 分组，无需在页面选择。列表只显示该分组可用的模型，并按服务端元数据筛选；对 Codex，`openai` 模型也会作为 Responses 候选，是否真正兼容由保存前的调用确认。默认优先选中 `auto`；没有兼容的 `auto` 时选择第一个可用模型。平台名称默认为 `winwin`，可自行修改，切换模型时保留。
+3. 选择目标客户端、平台名称和模型。接口固定使用 `default` 分组，无需在页面选择。列表只显示该分组可用的模型，并按服务端元数据筛选；对 Codex，`openai` 模型也会作为 Responses 候选，是否真正兼容由保存前的调用确认。默认优先选中 `auto`；没有兼容的 `auto` 时选择第一个可用模型。平台名称默认为 `winwin`，可自行修改，切换模型时保留。
 4. 按上游实际能力设置图像、工具调用和推理档位，不能从模型别名推断。
 5. 点击 **创建并添加**。同一实例、同一账号创建或复用一把 power-switch 专属密钥，不设置模型限制；首次创建使用 `default` 分组决定密钥的实际访问范围。应用先检查所选模型是否可访问，再发送一次模型调用；只有收到所选协议的有效文本回复才保存到模型库。调用可能消耗账户额度；失败时密钥可能已创建，重试会复用。
 6. 可主动显示或复制密钥。保存后按需点击 **测试连接** 可再次调用模型；测试只确认基本文本调用及响应格式，不证明工具调用、图像、流式或上下文能力。应用到 Agent 时只预览并写入配置，不重复调用模型。
diff --git a/package.json b/package.json
index b584c36..dbc4d4c 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "power-switch",
   "private": true,
-  "version": "0.1.6-rc.3",
+  "version": "0.1.6-rc.4",
   "type": "module",
   "packageManager": "pnpm@10.18.3",
   "pnpm": {
diff --git a/src-tauri/Cargo.lock b/src-tauri/Cargo.lock
index 59ac7fe..d85da55 100644
--- a/src-tauri/Cargo.lock
+++ b/src-tauri/Cargo.lock
@@ -2976,7 +2976,7 @@ dependencies = [
 
 [[package]]
 name = "power-switch"
-version = "0.1.6-rc.3"
+version = "0.1.6-rc.4"
 dependencies = [
  "base64 0.22.1",
  "dirs",
diff --git a/src-tauri/Cargo.toml b/src-tauri/Cargo.toml
index 33d6137..0bc3246 100644
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "power-switch"
-version = "0.1.6-rc.3"
+version = "0.1.6-rc.4"
 description = "Local model configuration switcher for coding agents"
 edition = "2021"
 rust-version = "1.92"
diff --git a/src-tauri/src/update_desktop.rs b/src-tauri/src/update_desktop.rs
index 25bee93..f8df23c 100644
--- a/src-tauri/src/update_desktop.rs
+++ b/src-tauri/src/update_desktop.rs
@@ -106,32 +106,36 @@ fn manifest_url(release: &GithubRelease) -> AppResult<Url> {
     Url::parse(&manifest.browser_download_url).map_err(|_| "更新清单地址无效".into())
 }
 
-/// List published releases through the official API so RC builds can be found without changing the stable feed.
+/// Bound the complete GitHub release scan so pagination cannot leave update checks hanging.
 async fn github_releases() -> AppResult<Vec<GithubRelease>> {
     let client = reqwest::Client::builder()
-        .timeout(Duration::from_secs(30))
+        .timeout(Duration::from_secs(15))
         .user_agent("power-switch-updater")
         .build()
         .map_err(|error| format!("无法初始化更新检查：{error}"))?;
-    let mut releases = Vec::new();
-    for page in 1..=10 {
-        let batch: Vec<GithubRelease> = client
-            .get(format!("{RELEASES_API}?per_page=100&page={page}"))
-            .header("Accept", "application/vnd.github+json")
-            .send()
-            .await
-            .and_then(reqwest::Response::error_for_status)
-            .map_err(|error| format!("无法获取 GitHub 发布列表：{error}"))?
-            .json()
-            .await
-            .map_err(|error| format!("无法解析 GitHub 发布列表：{error}"))?;
-        let count = batch.len();
-        releases.extend(batch);
-        if count < 100 {
-            return Ok(releases);
+    tokio::time::timeout(Duration::from_secs(30), async {
+        let mut releases = Vec::new();
+        for page in 1..=10 {
+            let batch: Vec<GithubRelease> = client
+                .get(format!("{RELEASES_API}?per_page=100&page={page}"))
+                .header("Accept", "application/vnd.github+json")
+                .send()
+                .await
+                .and_then(reqwest::Response::error_for_status)
+                .map_err(|error| format!("无法获取 GitHub 发布列表：{error}"))?
+                .json()
+                .await
+                .map_err(|error| format!("无法解析 GitHub 发布列表：{error}"))?;
+            let count = batch.len();
+            releases.extend(batch);
+            if count < 100 {
+                return Ok(releases);
+            }
         }
-    }
-    Err("发布列表过长，无法安全判断最新版本".into())
+        Err("发布列表过长，无法安全判断最新版本".into())
+    })
+    .await
+    .map_err(|_| "获取 GitHub 发布列表超时，请稍后重试".to_string())?
 }
 
 /// Let Tauri parse the signed manifest and compare it with this installed app version.
diff --git a/src-tauri/tauri.conf.json b/src-tauri/tauri.conf.json
index ee58997..0649c1e 100644
--- a/src-tauri/tauri.conf.json
+++ b/src-tauri/tauri.conf.json
@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "power-switch",
-  "version": "0.1.6-rc.3",
+  "version": "0.1.6-rc.4",
   "identifier": "com.powerswitch.desktop",
   "build": {
     "beforeDevCommand": "pnpm dev:web",
@@ -30,7 +30,7 @@
     "targets": "all",
     "windows": {
       "wix": {
-        "version": "0.1.6.3"
+        "version": "0.1.6.4"
       }
     },
     "shortDescription": "模型随心切换",
diff --git a/src/App.tsx b/src/App.tsx
index bd968f1..fc1206b 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -562,26 +562,6 @@ export default function App() {
               </div>
             )}
           </header>
-          {notice && (
-            <div
-              role={notice.kind === "error" ? "alert" : "status"}
-              className={`notification ${notice.kind}`}
-            >
-              {notice.kind === "success" ? (
-                <CheckCircle2 size={19} />
-              ) : (
-                <CircleHelp size={19} />
-              )}
-              <span>{notice.text}</span>
-              <button
-                className="icon-button"
-                aria-label="关闭提示"
-                onClick={() => setNotice(null)}
-              >
-                <X size={16} />
-              </button>
-            </div>
-          )}
           {!data ? (
             <div className="empty-state">
               <LoaderCircle className="spin" />
@@ -1037,6 +1017,26 @@ export default function App() {
           </footer>
         </div>
       </main>
+      {notice && (
+        <div
+          role={notice.kind === "error" ? "alert" : "status"}
+          className={`notification ${notice.kind}`}
+        >
+          {notice.kind === "success" ? (
+            <CheckCircle2 size={19} />
+          ) : (
+            <CircleHelp size={19} />
+          )}
+          <span>{notice.text}</span>
+          <button
+            className="icon-button"
+            aria-label="关闭提示"
+            onClick={() => setNotice(null)}
+          >
+            <X size={16} />
+          </button>
+        </div>
+      )}
       {modal?.kind === "guide" && (
         <NewcomerGuide
           onClose={closeModal}
diff --git a/src/NewApiDialog.tsx b/src/NewApiDialog.tsx
index 159c3b9..53647d5 100644
--- a/src/NewApiDialog.tsx
+++ b/src/NewApiDialog.tsx
@@ -451,7 +451,7 @@ export function NewApiDialog({
             </div>
             <div className="new-api-fields">
               <label className="field">
-                目前客户端
+                目标客户端
                 <select
                   value={agent}
                   disabled={Boolean(busy)}
@@ -499,7 +499,7 @@ export function NewApiDialog({
                 </select>
                 <span className="field-hint">
                   {agent === "codex"
-                    ? "显示 default 分组中的 OpenAI 模型；保存前会调用 Responses 接口验证。"
+                    ? "显示 default 分组中的 OpenAI 模型候选；创建密钥后会调用 Responses 接口，通过测试才保存。"
                     : "仅显示 default 分组中支持当前客户端的模型。"}
                 </span>
               </label>
diff --git a/src/NewcomerGuide.tsx b/src/NewcomerGuide.tsx
index 4e794bd..264bce7 100644
--- a/src/NewcomerGuide.tsx
+++ b/src/NewcomerGuide.tsx
@@ -89,7 +89,7 @@ export function NewcomerGuide({
                   <KeyRound size={20} /> 从 New API 添加
                 </div>
                 <div className="newcomer-demo-row">
-                  <span>目前客户端</span>
+                  <span>目标客户端</span>
                   <strong>WorkBuddy</strong>
                 </div>
                 <div className="newcomer-demo-row">
diff --git a/src/assets/agents/codex.png b/src/assets/agents/codex.png
new file mode 100644
index 0000000..dc265ec
Binary files /dev/null and b/src/assets/agents/codex.png differ
diff --git a/src/components.tsx b/src/components.tsx
index 2335e30..a4e675b 100644
--- a/src/components.tsx
+++ b/src/components.tsx
@@ -8,6 +8,7 @@ import {
 } from "react";
 import { api } from "./api";
 import claudeAgentIcon from "./assets/agents/claude.png";
+import codexAgentIcon from "./assets/agents/codex.png";
 import workbuddyAgentIcon from "./assets/agents/workbuddy.png";
 import {
   ChevronDown,
@@ -88,7 +89,7 @@ export function Modal({
   );
 }
 
-/** Show the platform name's first character, uppercasing English initials and preserving Chinese characters. */
+/** Show the native Agent icon for each supported protocol, falling back to the model initial. */
 export function ProtocolMark({
   protocol,
   name,
@@ -104,7 +105,9 @@ export function ProtocolMark({
       ? workbuddyAgentIcon
       : protocol === "anthropic-messages"
         ? claudeAgentIcon
-        : null;
+        : protocol === "openai-responses"
+          ? codexAgentIcon
+          : null;
   return (
     <span
       className={`protocol-mark ${protocol} ${small ? "small" : ""} ${agentIcon ? "brand-icon" : ""}`}
diff --git a/src/styles.css b/src/styles.css
index 4148041..8fab2fd 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -617,7 +617,6 @@ h1 {
 .openai-responses.protocol-tag {
   color: var(--green);
   background: var(--green-soft);
-  opacity: 0.48;
 }
 .anthropic-messages.protocol-mark,
 .anthropic-messages.protocol-tag {
@@ -866,17 +865,25 @@ h1 {
   letter-spacing: 1.5px;
 }
 .notification {
+  position: fixed;
+  top: 18px;
+  left: calc((100vw + 228px) / 2);
+  transform: translateX(-50%);
+  z-index: 60;
+  width: min(420px, calc(100vw - 228px - 48px));
+  max-height: min(280px, calc(100vh - 106px));
   padding: 13px 15px;
   border: 1px solid var(--border);
   border-radius: 8px;
   display: flex;
-  align-items: center;
+  align-items: flex-start;
   gap: 9px;
-  margin-bottom: 18px;
   font-size: 12px;
   background: var(--surface);
   line-height: 1.7;
   overflow-wrap: anywhere;
+  overflow-y: auto;
+  box-shadow: 0 10px 30px #0000001c;
 }
 .notification > span {
   flex: 1;
@@ -888,8 +895,6 @@ h1 {
 .notification.error {
   color: #bc6857;
   background: var(--orange-soft);
-  position: relative;
-  z-index: 60;
 }
 .empty-state {
   padding: 62px 24px;
@@ -1604,6 +1609,10 @@ textarea {
     margin-left: 198px;
     width: calc(100% - 198px);
   }
+  .notification {
+    left: calc((100vw + 198px) / 2);
+    width: min(420px, calc(100vw - 198px - 48px));
+  }
   .page-content {
     padding: 30px 25px 22px;
   }
@@ -1676,6 +1685,10 @@ textarea {
     margin-left: 76px;
     width: calc(100% - 76px);
   }
+  .notification {
+    left: calc((100vw + 76px) / 2);
+    width: min(420px, calc(100vw - 76px - 48px));
+  }
   .page-content {
     padding: 26px 22px;
   }
@@ -1713,6 +1726,11 @@ textarea {
   }
 }
 @media (max-width: 580px) {
+  .notification {
+    top: 61px;
+    width: calc(100vw - 76px - 30px);
+    max-height: min(280px, calc(100vh - 76px));
+  }
   .page-content {
     padding: 25px 15px;
   }
diff --git a/src/test/app.test.tsx b/src/test/app.test.tsx
index 7066f9a..dac3361 100644
--- a/src/test/app.test.tsx
+++ b/src/test/app.test.tsx
@@ -8,7 +8,12 @@ import {
 import userEvent from "@testing-library/user-event";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import App from "../App";
-import { AgentPicker, ApplyReview, ModelForm } from "../components";
+import {
+  AgentPicker,
+  ApplyReview,
+  ModelForm,
+  ProtocolMark,
+} from "../components";
 import {
   newModel,
   type AppData,
@@ -90,6 +95,21 @@ beforeEach(() => {
 });
 afterEach(() => vi.useRealTimers());
 
+describe("Agent icons", () => {
+  it("shows the Codex icon for OpenAI Responses models", () => {
+    const { container } = render(
+      <ProtocolMark protocol="openai-responses" name="专注代码" />,
+    );
+    const mark = container.querySelector(".protocol-mark.openai-responses");
+    expect(mark).toHaveClass("brand-icon");
+    expect(mark?.querySelector("img")).toHaveAttribute(
+      "src",
+      expect.stringContaining("codex.png"),
+    );
+    expect(mark).not.toHaveTextContent("专");
+  });
+});
+
 describe("model editing", () => {
   it("offers Responses for Codex while retaining the provider model-list requirement", async () => {
     render(
@@ -532,6 +552,33 @@ describe("temporary model test feedback", () => {
 });
 
 describe("settings and backup controls", () => {
+  it("shows model deletion in the fixed global tip", async () => {
+    vi.mocked(api.delete).mockResolvedValue();
+    render(<App />);
+    await screen.findByText("我的模型");
+    await userEvent.click(
+      screen.getByRole("button", { name: "删除 我的模型" }),
+    );
+    await userEvent.click(screen.getByRole("button", { name: "确认删除" }));
+    const notice = await screen.findByRole("status");
+    expect(notice).toHaveTextContent("模型已从模型库删除。");
+    expect(notice.parentElement).toHaveClass("app-shell");
+    expect(notice.closest(".page-content")).toBeNull();
+    await userEvent.click(screen.getByRole("button", { name: "关闭提示" }));
+    expect(screen.queryByRole("status")).not.toBeInTheDocument();
+  });
+
+  it("keeps the SKILL sidebar entry unavailable", async () => {
+    render(<App />);
+    await screen.findByText("我的模型");
+    const skills = screen.getByRole("button", { name: /SKILL 技能/ });
+    expect(skills).toBeDisabled();
+    expect(skills).toHaveTextContent("待开放");
+    expect(
+      screen.getByRole("heading", { name: /^模型库/ }),
+    ).toBeInTheDocument();
+  });
+
   it("keeps native selections in the draft until saving and preserves them on cancel", async () => {
     vi.mocked(api.data).mockResolvedValue({
       ...data,
diff --git a/src/test/new-api.test.tsx b/src/test/new-api.test.tsx
index 686f030..b11bd0a 100644
--- a/src/test/new-api.test.tsx
+++ b/src/test/new-api.test.tsx
@@ -144,7 +144,7 @@ describe("New API connector", () => {
       />,
     );
     await screen.findByRole("option", { name: "chat-model" });
-    const client = screen.getByLabelText("目前客户端");
+    const client = screen.getByLabelText("目标客户端");
     expect(client.querySelector('option[value="codex"]')).toBeEnabled();
     await userEvent.selectOptions(client, "codex");
     expect(
diff --git a/src/test/theme.test.tsx b/src/test/theme.test.tsx
index d7efb71..0c5ecaf 100644
--- a/src/test/theme.test.tsx
+++ b/src/test/theme.test.tsx
@@ -1,4 +1,4 @@
-import { act, render, screen } from "@testing-library/react";
+import { act, fireEvent, render, screen } from "@testing-library/react";
 import userEvent from "@testing-library/user-event";
 import { beforeEach, describe, expect, it, vi } from "vitest";
 import App from "../App";
@@ -47,6 +47,28 @@ async function renderSettings() {
 }
 
 describe("appearance settings", () => {
+  it("shows fixed notices outside scrollable content and restarts the five-second timer", async () => {
+    await renderSettings();
+    fireEvent.click(screen.getByRole("button", { name: "深色" }));
+    const first = await screen.findByRole("status");
+    expect(first).toHaveTextContent("主题已保存。");
+    expect(first.parentElement).toHaveClass("app-shell");
+    expect(first.closest(".page-content")).toBeNull();
+
+    vi.useFakeTimers();
+    act(() => vi.advanceTimersByTime(3000));
+    await act(async () => {
+      fireEvent.click(screen.getByRole("button", { name: "浅色" }));
+      await Promise.resolve();
+    });
+    expect(screen.getByRole("status")).toHaveTextContent("主题已保存。");
+    act(() => vi.advanceTimersByTime(2000));
+    expect(screen.getByRole("status")).toBeInTheDocument();
+    act(() => vi.advanceTimersByTime(3000));
+    expect(screen.queryByRole("status")).not.toBeInTheDocument();
+    vi.useRealTimers();
+  });
+
   it("saves a selected theme immediately and keeps it after navigation", async () => {
     const { user } = await renderSettings();
     await user.click(screen.getByRole("button", { name: "深色" }));
@@ -142,11 +164,29 @@ describe("appearance settings", () => {
     vi.mocked(api.settings).mockRejectedValueOnce(new Error("设置保存失败"));
     const { user } = await renderSettings();
     await user.click(screen.getByRole("button", { name: "深色" }));
-    expect(await screen.findByRole("alert")).toHaveTextContent("设置保存失败");
+    const notice = await screen.findByRole("alert");
+    expect(notice).toHaveTextContent("设置保存失败");
+    expect(notice.parentElement).toHaveClass("app-shell");
     expect(document.documentElement).toHaveAttribute("data-theme", "light");
     expect(screen.queryByText("设置已保存。")).not.toBeInTheDocument();
 
     await user.click(screen.getByRole("button", { name: /^模型库/ }));
     expect(document.documentElement).toHaveAttribute("data-theme", "light");
+    await user.click(screen.getByRole("button", { name: "关闭提示" }));
+    expect(screen.queryByRole("alert")).not.toBeInTheDocument();
+  });
+
+  it("expires error tips after five seconds", async () => {
+    vi.mocked(api.settings).mockRejectedValueOnce(new Error("设置保存失败"));
+    await renderSettings();
+    vi.useFakeTimers();
+    await act(async () => {
+      fireEvent.click(screen.getByRole("button", { name: "深色" }));
+      await Promise.resolve();
+    });
+    expect(screen.getByRole("alert")).toHaveTextContent("设置保存失败");
+    act(() => vi.advanceTimersByTime(5000));
+    expect(screen.queryByRole("alert")).not.toBeInTheDocument();
+    vi.useRealTimers();
   });
 });
diff --git a/src/test/update.test.tsx b/src/test/update.test.tsx
index 763756f..a7f7c26 100644
--- a/src/test/update.test.tsx
+++ b/src/test/update.test.tsx
@@ -116,6 +116,17 @@ describe("sidebar app updates", () => {
     expect(screen.queryByText("检查更新")).not.toBeInTheDocument();
   });
 
+  it("shows manual update results in the fixed global tip", async () => {
+    checkForUpdate.mockResolvedValue(null);
+    render(<App />);
+    fireEvent.click(await screen.findByRole("button", { name: "设置" }));
+    fireEvent.click(screen.getByRole("button", { name: "检查更新" }));
+    const message = await screen.findByText("当前更新通道已是最新版本。");
+    const notice = message.closest('[role="status"]');
+    expect(notice).toHaveTextContent("当前更新通道已是最新版本。");
+    expect(notice?.parentElement).toHaveClass("app-shell");
+  });
+
   it("places software updates after local data in Settings", async () => {
     render(<App />);
     fireEvent.click(await screen.findByRole("button", { name: "设置" }));