feat: Add theme toggle, implement interactive simulator menu, and enhance dashboard stats API.

src/components/theme-toggle.tsx

@@ -0,0 +1,38 @@
+"use client";
+
+import * as React from "react";
+import { Moon, Sun } from "lucide-react";
+import { useTheme } from "next-themes";
+
+export function ThemeToggle() {
+    const { theme, setTheme } = useTheme();
+    const [mounted, setMounted] = React.useState(false);
+
+    // Avoid hydration mismatch
+    React.useEffect(() => {
+        setMounted(true);
+    }, []);
+
+    if (!mounted) {
+        return (
+            <div className="w-10 h-10 rounded-xl bg-white/5 border border-white/10" />
+        );
+    }
+
+    return (
+        <button
+            onClick={() => setTheme(theme === "dark" ? "light" : "dark")}
+            className="w-10 h-10 rounded-xl bg-white/5 border border-white/10 flex items-center justify-center text-slate-400 hover:text-white hover:bg-white/10 transition-all duration-300 group relative overflow-hidden"
+            aria-label="Toggle theme"
+        >
+            <div className="absolute inset-0 bg-gradient-to-br from-sky-500/10 to-transparent opacity-0 group-hover:opacity-100 transition-opacity" />
+            <div className="relative z-10">
+                {theme === "dark" ? (
+                    <Sun className="w-5 h-5 animate-in zoom-in duration-300" />
+                ) : (
+                    <Moon className="w-5 h-5 animate-in zoom-in duration-300" />
+                )}
+            </div>
+        </button>
+    );
+}