feat: implement HeaderBar and ScanTerminal UI layout components for dashboard navigation and decision workspace

frontend/components/dashboard/HeaderBar.tsx

@@ -10,8 +10,6 @@ import {
   RotateCw,
   BookOpen,
   MoreHorizontal,
-  Moon,
-  Sun,
 } from "lucide-react";
 import { useEffect, useState } from "react";
 import { useDashboardStore, useProAccess } from "@/hooks/useDashboardStore";
@@ -42,7 +40,6 @@ export function HeaderBar({
   const { proAccess } = useProAccess();
   const { locale, t, toggleLocale } = useI18n();
   const pathname = usePathname();
-  const [theme, setTheme] = useState<"dark" | "light">("dark");
   const isAuthenticated = proAccess.authenticated;
   const docsHref = "/docs/intro";
   const docsActive = pathname?.startsWith("/docs");
@@ -94,24 +91,6 @@ export function HeaderBar({
         ? `Pro ${Math.max(expiryInfo?.daysLeft || 0, 0)}d left`
         : `Pro 还剩 ${Math.max(expiryInfo?.daysLeft || 0, 0)} 天`;
 
-  useEffect(() => {
-    const savedTheme =
-      typeof window !== "undefined"
-        ? window.localStorage.getItem("polyweather_theme")
-        : null;
-    const nextTheme = savedTheme === "light" ? "light" : "dark";
-    setTheme(nextTheme);
-    document.documentElement.classList.toggle("dark", nextTheme === "dark");
-    document.documentElement.classList.toggle("light", nextTheme === "light");
-  }, []);
-
-  const toggleTheme = () => {
-    const nextTheme = theme === "dark" ? "light" : "dark";
-    setTheme(nextTheme);
-    document.documentElement.classList.toggle("dark", nextTheme === "dark");
-    document.documentElement.classList.toggle("light", nextTheme === "light");
-    window.localStorage.setItem("polyweather_theme", nextTheme);
-  };
 
   return (
     <header className="header">
@@ -165,19 +144,6 @@ export function HeaderBar({
           <RotateCw size={16} strokeWidth={2} />
         </button>
 
-        <button
-          type="button"
-          className="header-utility-btn"
-          aria-label={theme === "dark" ? "切换到明亮模式" : "切换到暗黑模式"}
-          title={theme === "dark" ? "明亮模式" : "暗黑模式"}
-          onClick={toggleTheme}
-        >
-          {theme === "dark" ? (
-            <Sun size={15} strokeWidth={2} />
-          ) : (
-            <Moon size={15} strokeWidth={2} />
-          )}
-        </button>
 
         <Link
           href={docsHref}