fix: 3 erros React — next/script p/ tema, 'use client' Footer+donate, remover metadata incompatível

components/layout/SideMenu.tsx

@@ -43,7 +43,7 @@ export default function SideMenu({ open, onClose }: SideMenuProps) {
     const isDark = document.documentElement.classList.toggle('dark');
     document.documentElement.setAttribute('data-theme', isDark ? 'dark' : 'light');
     setDark(isDark);
-    try { localStorage.setItem('pawlink-theme', isDark ? 'dark' : 'light'); } catch (_) {}
+    try { localStorage.setItem('petlink-theme', isDark ? 'dark' : 'light'); } catch (_) {}
   };
 
   const menuItems = [