refactor(responsive): Adjust breakpoint from md to lg for better layout

The previous `md` breakpoint (768px) caused the desktop layout to activate too early, resulting in a cramped appearance on tablet-sized screens.

This commit updates the responsive design by changing the primary breakpoint from `md` to `lg` (1024px) across the home page, contact page, and main layouts. This change ensures a more appropriate and visually balanced layout is maintained on medium-sized devices, improving the overall user experience.

app/_contact-us/form.tsx

@@ -38,22 +38,22 @@ const ContactUsForm = ({
   };
 
   const gridColsClass = {
-    1: "md:grid-cols-1",
-    2: "md:grid-cols-2",
-    3: "md:grid-cols-3",
-    4: "md:grid-cols-4",
+    1: "lg:grid-cols-1",
+    2: "lg:grid-cols-2",
+    3: "lg:grid-cols-3",
+    4: "lg:grid-cols-4",
   }[columnsPerRow];
 
   const colSpanClass = {
-    1: "md:col-span-1",
-    2: "md:col-span-2",
-    3: "md:col-span-3",
-    4: "md:col-span-4",
+    1: "lg:col-span-1",
+    2: "lg:col-span-2",
+    3: "lg:col-span-3",
+    4: "lg:col-span-4",
   }[columnsPerRow];
 
   return (
     <form
-      className={`w-full px-4 md:px-16 py-10 grid ${gridColsClass} gap-4`}
+      className={`w-full px-4 lg:px-16 py-10 grid ${gridColsClass} gap-4`}
       onSubmit={handleSubmit(onSubmit)}>
       <InputGroup
         id="full_name"