Fix SSR hydration issues and finalize deployment config

src/components/ThemeProvider.tsx

@@ -42,13 +42,9 @@ export function ThemeProvider({ children }: { children: React.ReactNode }) {
     });
   };
 
-  if (!mounted) {
-    return <>{children}</>;
-  }
-
   return (
     <ThemeContext.Provider value={{ theme, toggleTheme }}>
-      {children}
+      {mounted ? children : <div>{children}</div>}
     </ThemeContext.Provider>
   );
 }