refactor: overhaul UI for streamlined user experience

Redesign navigation, home overview, user portrait, and valuation pages
with improved functionality and responsive design.

Co-authored-by: null <4804959+fnvtk@users.noreply.github.com>

app/components/AuthProvider.tsx

@@ -0,0 +1,66 @@
+"use client"
+
+import { createContext, useContext, useEffect, useState, type ReactNode } from "react"
+import { useRouter } from "next/navigation"
+
+interface AuthContextType {
+  isAuthenticated: boolean
+  token: string | null
+  login: (token: string) => void
+  logout: () => void
+}
+
+const AuthContext = createContext<AuthContextType>({
+  isAuthenticated: false,
+  token: null,
+  login: () => {},
+  logout: () => {},
+})
+
+export const useAuth = () => useContext(AuthContext)
+
+interface AuthProviderProps {
+  children: ReactNode
+}
+
+export function AuthProvider({ children }: AuthProviderProps) {
+  const [token, setToken] = useState<string | null>(null)
+  const [isAuthenticated, setIsAuthenticated] = useState(false)
+  const router = useRouter()
+
+  useEffect(() => {
+    // 客户端检查token
+    if (typeof window !== "undefined") {
+      const storedToken = localStorage.getItem("token")
+      if (storedToken) {
+        setToken(storedToken)
+        setIsAuthenticated(true)
+      } else {
+        setIsAuthenticated(false)
+        // 暂时禁用重定向逻辑，允许访问所有页面
+        // 将来需要恢复登录验证时，取消下面注释
+        /*
+        if (pathname !== "/login") {
+          router.push("/login")
+        }
+        */
+      }
+    }
+  }, [])
+
+  const login = (newToken: string) => {
+    localStorage.setItem("token", newToken)
+    setToken(newToken)
+    setIsAuthenticated(true)
+  }
+
+  const logout = () => {
+    localStorage.removeItem("token")
+    setToken(null)
+    setIsAuthenticated(false)
+    // 登出后不强制跳转到登录页
+    // router.push("/login")
+  }
+
+  return <AuthContext.Provider value={{ isAuthenticated, token, login, logout }}>{children}</AuthContext.Provider>
+}