refactor(brand): 重构品牌系统，移除 SESSION_BRAND 并完善初始化逻辑

- 将 DEFAULT_BRAND 重命名为 XCLAW_BRAND，统一品牌命名规范
- 删除未使用的 SESSION_BRAND 类型和相关配置
- 优化 getInitialBrandFromBrowser 逻辑：根据 isSxwz 参数直接设置并返回对应品牌
- 更新品牌颜色 tokens 和 CSS 选择器测试
- 同步更新 provider.tsx 和相关测试用例

frontend/src/core/brand/brand-session.test.ts

@@ -17,12 +17,12 @@ const SXWZ_BRAND_PRIMARY = `#${"000F33"}`;
 
 void test("parseBrandFromSearchParams returns correct brand per param value", () => {
   assert.equal(parseBrandFromSearchParams(new URLSearchParams("isSxwz=true")), "sxwz");
-  assert.equal(parseBrandFromSearchParams(new URLSearchParams("isSxwz=false")), "default");
+  assert.equal(parseBrandFromSearchParams(new URLSearchParams("isSxwz=false")), "xclaw");
   assert.equal(parseBrandFromSearchParams(new URLSearchParams("")), null);
 });
 
-void test("resolveBrandSession falls back to default without url or storage", () => {
-  assert.equal(resolveBrandSession({ urlBrand: null, storedBrand: null }), "default");
+void test("resolveBrandSession falls back to xclaw without url or storage", () => {
+  assert.equal(resolveBrandSession({ urlBrand: null, storedBrand: null }), "xclaw");
 });
 
 void test("resolveBrandSession keeps stored sxwz when later url omits the flag", () => {
@@ -31,28 +31,28 @@ void test("resolveBrandSession keeps stored sxwz when later url omits the flag",
 
 void test("resolveBrandSession downgrades stored sxwz when url explicitly sets isSxwz=false", () => {
   const urlBrand = parseBrandFromSearchParams(new URLSearchParams("isSxwz=false"));
-  assert.equal(resolveBrandSession({ urlBrand, storedBrand: "sxwz" }), "default");
+  assert.equal(resolveBrandSession({ urlBrand, storedBrand: "sxwz" }), "xclaw");
 });
 
 void test("resolveBrandSession upgrades to sxwz when url flag is true", () => {
   const urlBrand = parseBrandFromSearchParams(new URLSearchParams("isSxwz=true"));
-  assert.equal(resolveBrandSession({ urlBrand, storedBrand: "default" }), "sxwz");
+  assert.equal(resolveBrandSession({ urlBrand, storedBrand: "xclaw" }), "sxwz");
 });
 
 void test("getBrandRootClassName returns stable workspace hook classes", () => {
-  assert.equal(getBrandRootClassName("default"), "brand-default");
+  assert.equal(getBrandRootClassName("xclaw"), "brand-xclaw");
   assert.equal(getBrandRootClassName("sxwz"), "brand-sxwz");
   assert.equal(BRAND_SESSION_STORAGE_KEY, "deerflow.brand-session");
 });
 
 void test("getBrandPrimaryColor returns the right global brand primary", () => {
-  assert.equal(getBrandPrimaryColor("default"), DEFAULT_BRAND_PRIMARY);
+  assert.equal(getBrandPrimaryColor("xclaw"), DEFAULT_BRAND_PRIMARY);
   assert.equal(getBrandPrimaryColor("sxwz"), SXWZ_BRAND_PRIMARY);
 });
 
 void test("getBrandPrimaryColorWithAlpha preserves alpha values across brands", () => {
   assert.equal(
-    getBrandPrimaryColorWithAlpha("default", "1A"),
+    getBrandPrimaryColorWithAlpha("xclaw", "1A"),
     `${DEFAULT_BRAND_PRIMARY}1A`,
   );
   assert.equal(
@@ -60,7 +60,7 @@ void test("getBrandPrimaryColorWithAlpha preserves alpha values across brands",
     `${SXWZ_BRAND_PRIMARY}1A`,
   );
   assert.equal(
-    getBrandPrimaryColorWithAlpha("default", "99"),
+    getBrandPrimaryColorWithAlpha("xclaw", "99"),
     `${DEFAULT_BRAND_PRIMARY}99`,
   );
   assert.equal(
@@ -71,25 +71,29 @@ void test("getBrandPrimaryColorWithAlpha preserves alpha values across brands",
 
 void test("getInitialBrandFromBrowser prioritizes url brand on first render", () => {
   const searchParams = new URLSearchParams("isSxwz=true");
-  assert.equal(getInitialBrandFromBrowser({ searchParams, storedBrand: null }), "sxwz");
+  const storage = {
+    getItem: () => null,
+    setItem: () => {},
+  };
+  assert.equal(getInitialBrandFromBrowser({ searchParams, storage }), "sxwz");
   assert.equal(
     getInitialBrandFromBrowser({
       searchParams: new URLSearchParams("isSxwz=false"),
-      storedBrand: "sxwz",
+      storage,
     }),
-    "default",
+    "xclaw",
   );
   assert.equal(
     getInitialBrandFromBrowser({
       searchParams: new URLSearchParams(""),
-      storedBrand: "sxwz",
+      storage,
     }),
-    "sxwz",
+    "xclaw",
   );
 });
 
 void test("syncBrandClassName rewrites brand classes on arbitrary targets", () => {
-  const classSet = new Set(["foo", "brand-default"]);
+  const classSet = new Set(["foo", "brand-xclaw"]);
   const target = {
     classList: {
       add: (value: string) => classSet.add(value),
@@ -100,6 +104,6 @@ void test("syncBrandClassName rewrites brand classes on arbitrary targets", () =
   syncBrandClassName(target, "sxwz");
 
   assert.equal(classSet.has("foo"), true);
-  assert.equal(classSet.has("brand-default"), false);
+  assert.equal(classSet.has("brand-xclaw"), false);
   assert.equal(classSet.has("brand-sxwz"), true);
 });

frontend/src/core/brand/index.ts

@@ -1,12 +1,12 @@
 export const BRAND_SESSION_STORAGE_KEY = "deerflow.brand-session";
-export const DEFAULT_BRAND = "default" as const;
-const SXWZ_BRAND = "sxwz" as const;
+export const XCLAW_BRAND = "xclaw" as const;
+export const SXWZ_BRAND = "sxwz" as const;
 const BRAND_PRIMARY_COLORS = {
-  default: `#${"150033"}`,
+  xclaw: `#${"150033"}`,
   sxwz: `#${"000F33"}`,
 } as const;
 
-export type Brand = typeof DEFAULT_BRAND | typeof SXWZ_BRAND;
+export type Brand = typeof XCLAW_BRAND | typeof SXWZ_BRAND;
 
 export type BrandCopy = {
   productLabel: string;
@@ -16,7 +16,7 @@ export type BrandCopy = {
 };
 
 export const BRAND_COPY: Record<Brand, BrandCopy> = {
-  default: {
+  xclaw: {
     productLabel: "轻办公",
     appName: "coxworker",
     appLogoSrc: "/coxwork.png",
@@ -29,7 +29,7 @@ export const BRAND_COPY: Record<Brand, BrandCopy> = {
 };
 
 export function isBrand(value: string | null): value is Brand {
-  return value === DEFAULT_BRAND || value === SXWZ_BRAND;
+  return value === XCLAW_BRAND || value === SXWZ_BRAND;
 }
 
 export function parseBrandFromSearchParams(
@@ -37,7 +37,7 @@ export function parseBrandFromSearchParams(
 ): Brand | null {
   const value = searchParams.get("isSxwz");
   if (value === "true") return SXWZ_BRAND;
-  if (value === "false") return DEFAULT_BRAND;
+  if (value === "false") return XCLAW_BRAND;
   return null;
 }
 
@@ -52,30 +52,47 @@ export function resolveBrandSession({
     return SXWZ_BRAND;
   }
 
-  if (urlBrand === DEFAULT_BRAND) {
-    return DEFAULT_BRAND;
+  if (urlBrand === XCLAW_BRAND) {
+    return XCLAW_BRAND;
   }
 
   if (storedBrand === SXWZ_BRAND) {
     return SXWZ_BRAND;
   }
 
-  return DEFAULT_BRAND;
+  return XCLAW_BRAND;
 }
 
 export function getInitialBrandFromBrowser({
   searchParams,
-  storedBrand,
+  storage,
 }: {
   searchParams: URLSearchParams;
-  storedBrand: Brand | null;
+  storage: Pick<Storage, "getItem" | "setItem">;
 }): Brand {
-  const urlBrand = parseBrandFromSearchParams(searchParams);
-  return resolveBrandSession({ urlBrand, storedBrand });
+  const isSxwz = searchParams.get("isSxwz");
+
+  if (isSxwz === "true") {
+    storage.setItem(BRAND_SESSION_STORAGE_KEY, SXWZ_BRAND);
+    return SXWZ_BRAND;
+  }
+
+  if (isSxwz === "false") {
+    storage.setItem(BRAND_SESSION_STORAGE_KEY, XCLAW_BRAND);
+    return XCLAW_BRAND;
+  }
+
+  const storedBrand = storage.getItem(BRAND_SESSION_STORAGE_KEY);
+  if (storedBrand === SXWZ_BRAND || storedBrand === XCLAW_BRAND) {
+    return storedBrand;
+  }
+
+  return XCLAW_BRAND;
 }
 
 export function getBrandRootClassName(brand: Brand): string {
-  return brand === SXWZ_BRAND ? "brand-sxwz" : "brand-default";
+  if (brand === SXWZ_BRAND) return "brand-sxwz";
+  return "brand-xclaw";
 }
 
 type BrandClassTarget = {
@@ -89,7 +106,7 @@ export function syncBrandClassName(
   target: BrandClassTarget,
   brand: Brand,
 ): void {
-  target.classList.remove("brand-default", "brand-sxwz");
+  target.classList.remove("brand-xclaw", "brand-sxwz");
   target.classList.add(getBrandRootClassName(brand));
 }
 

frontend/src/core/brand/provider.tsx

@@ -4,7 +4,7 @@ import { createContext, useContext, useState, type ReactNode } from "react";
 
 import {
   BRAND_COPY,
-  DEFAULT_BRAND,
+  XCLAW_BRAND,
   getInitialBrandFromBrowser,
   getBrandRootClassName,
   type Brand,
@@ -21,16 +21,12 @@ const BrandContext = createContext<BrandContextValue | null>(null);
 
 function getInitialBrand(): Brand {
   if (typeof window === "undefined") {
-    return DEFAULT_BRAND;
+    return XCLAW_BRAND;
   }
 
-  const storedBrand = window.sessionStorage.getItem("deerflow.brand-session");
   return getInitialBrandFromBrowser({
     searchParams: new URLSearchParams(window.location.search),
-    storedBrand:
-      storedBrand === "sxwz" || storedBrand === DEFAULT_BRAND
-        ? storedBrand
-        : null,
+    storage: window.sessionStorage,
   });
 }
 

frontend/src/styles/globals-brand-selectors.test.ts

@@ -8,6 +8,6 @@ const currentDir = path.dirname(url.fileURLToPath(import.meta.url));
 const globalsCss = readFileSync(path.join(currentDir, "globals.css"), "utf8");
 
 void test("brand selectors target :root to outrank default root variables", () => {
-  assert.match(globalsCss, /:root\.brand-default\s*\{/);
+  assert.match(globalsCss, /:root\.brand-xclaw\s*\{/);
   assert.match(globalsCss, /:root\.brand-sxwz\s*\{/);
 });

frontend/src/styles/globals.css

@@ -68,7 +68,7 @@
 @source inline("bg-{background,muted,primary,secondary,accent}");
 @source inline("border-{border,input}");
 
-.brand-default {
+.brand-xclaw {
   --brand-color-primary: #150033;
   --brand-color-primary-10: #1500331a;
   --brand-color-primary-60: #15003399;

frontend/src/styles/workspace-color-tokens.ts

@@ -14,17 +14,17 @@ export type WorkspaceColorToken = {
 };
 
 export const BRAND_PRIMARY_COLOR_TOKENS = {
-  default: "#150033",
+  xclaw: "#150033",
   sxwz: "#000F33",
-  defaultAlpha10: "#1500331A",
+  xclawAlpha10: "#1500331A",
   sxwzAlpha10: "#000F331A",
-  defaultAlpha60: "#15003399",
+  xclawAlpha60: "#15003399",
   sxwzAlpha60: "#000F3399",
 } as const;
 
 // Token 键保持语义化且稳定：`ws-<role>-<level>`（不要再使用原始 hex 命名）。
 export const WORKSPACE_COLOR_TOKENS = {
-  "ws-base-1": { light: BRAND_PRIMARY_COLOR_TOKENS.default, dark: "#f4ebff" },
+  "ws-base-1": { light: BRAND_PRIMARY_COLOR_TOKENS.xclaw, dark: "#f4ebff" },
   "ws-fg-primary": { light: "#333333", dark: "#f5f5f5" },
   "ws-surface-subtle": { light: "#f9f8fa", dark: "#1f1f1f" },
   "ws-surface-elevated": { light: "#fbfafc", dark: "#24222a" },
@@ -36,7 +36,7 @@ export const WORKSPACE_COLOR_TOKENS = {
   "ws-text-subtle-strong": { light: "#000000c5", dark: "#ffffffcc" },
   "ws-border-hairline": { light: "#00000015", dark: "#ffffff1f" },
   "ws-accent-tint-soft": {
-    light: BRAND_PRIMARY_COLOR_TOKENS.defaultAlpha10,
+    light: BRAND_PRIMARY_COLOR_TOKENS.xclawAlpha10,
     dark: "#f4ebff24",
   },
   "ws-surface-app": { light: "#f8f9fb", dark: "#20242c" },