demo bug fixes

src/context/ThemeContext.jsx

@@ -9,12 +9,8 @@ export const ThemeProvider = ({ children }) => {
             if (savedTheme) {
                 return savedTheme;
             }
-            // Check system preference
-            if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
-                return 'dark';
-            }
         }
-        return 'light'; // Default to light if no preference
+        return 'dark'; // Default to dark for first-time visitors
     });
 
     useEffect(() => {