🎉 Gitea Mirror: Added

src/components/theme/ModeToggle.tsx

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+import * as React from "react";
+import { Moon, Sun } from "lucide-react";
+
+import { Button } from "@/components/ui/button";
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuTrigger,
+} from "@/components/ui/dropdown-menu";
+
+export function ModeToggle() {
+  const [theme, setThemeState] = React.useState<"light" | "dark" | "system">(
+    "light"
+  );
+
+  React.useEffect(() => {
+    const isDarkMode = document.documentElement.classList.contains("dark");
+    setThemeState(isDarkMode ? "dark" : "light");
+  }, []);
+
+  React.useEffect(() => {
+    const isDark =
+      theme === "dark" ||
+      (theme === "system" &&
+        window.matchMedia("(prefers-color-scheme: dark)").matches);
+    document.documentElement.classList[isDark ? "add" : "remove"]("dark");
+  }, [theme]);
+
+  return (
+    <DropdownMenu>
+      <DropdownMenuTrigger asChild>
+        <Button variant="outline" size="lg" className="has-[>svg]:px-3">
+          <Sun className="h-[1.2rem] w-[1.2rem] rotate-0 scale-100 transition-all dark:-rotate-90 dark:scale-0" />
+          <Moon className="absolute h-[1.2rem] w-[1.2rem] rotate-90 scale-0 transition-all dark:rotate-0 dark:scale-100" />
+          <span className="sr-only">Toggle theme</span>
+        </Button>
+      </DropdownMenuTrigger>
+      <DropdownMenuContent align="end">
+        <DropdownMenuItem onClick={() => setThemeState("light")}>
+          Light
+        </DropdownMenuItem>
+        <DropdownMenuItem onClick={() => setThemeState("dark")}>
+          Dark
+        </DropdownMenuItem>
+        <DropdownMenuItem onClick={() => setThemeState("system")}>
+          System
+        </DropdownMenuItem>
+      </DropdownMenuContent>
+    </DropdownMenu>
+  );
+}