added：增加Linux-server

write-server/src/components/ThemeToggle.tsx

@@ -0,0 +1,48 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { Moon, Sun } from "lucide-react";
+
+type Theme = "light" | "dark";
+
+export default function ThemeToggle() {
+  const [theme, setTheme] = useState<Theme>("light");
+
+  useEffect(() => {
+    const saved = localStorage.getItem("write-theme");
+    const nextTheme: Theme = saved === "dark" ? "dark" : "light";
+    setTheme(nextTheme);
+    if (nextTheme === "dark") {
+      document.documentElement.dataset.theme = "dark";
+    } else {
+      delete document.documentElement.dataset.theme;
+    }
+  }, []);
+
+  const toggleTheme = () => {
+    const nextTheme: Theme = theme === "dark" ? "light" : "dark";
+    setTheme(nextTheme);
+    localStorage.setItem("write-theme", nextTheme);
+    if (nextTheme === "dark") {
+      document.documentElement.dataset.theme = "dark";
+    } else {
+      delete document.documentElement.dataset.theme;
+    }
+  };
+
+  const isDark = theme === "dark";
+  const Icon = isDark ? Sun : Moon;
+
+  return (
+    <button
+      type="button"
+      onClick={toggleTheme}
+      className="mb-3 flex w-full items-center justify-between rounded-md border border-line px-3 py-2 text-[12px] text-muted transition-colors hover:bg-bg hover:text-accent"
+      title={isDark ? "切换到浅色模式" : "切换到夜间模式"}
+      aria-label={isDark ? "切换到浅色模式" : "切换到夜间模式"}
+    >
+      <span>{isDark ? "浅色模式" : "夜间模式"}</span>
+      <Icon size={14} />
+    </button>
+  );
+}