feat: implemented custom titlebar for windows and linux

src/components/icons/unmaximize.tsx

@@ -0,0 +1,10 @@
+export function UnmaximizeIcon({ className }: { className?: string }) {
+    return (
+        <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16" className={className}>
+            <g fill="currentColor">
+                <path d="M3 5v9h9V5zm8 8H4V6h7z" />
+                <path fillRule="evenodd" d="M5 5h1V4h7v7h-1v1h2V3H5z" clipRule="evenodd" />
+            </g>
+        </svg>
+    );
+}