Add environment variable validation and parsing

Adds a validation schema for the application's environment variables using the Zod library. The parsed environment variables are then exported as constants that can be imported throughout the application, replacing the direct use of process.env.

components/ui/forms/Button.tsx

@@ -14,7 +14,7 @@ const Button: FunctionComponent<FormButtonProps> = ({
   // eslint-disable-next-line react/button-has-type
   <button
     type={type}
-    className={`btn btn-primary w-full rounded-xl ${isSubmitting ? 'loading' : ''}`}
+    className={`btn-primary btn w-full rounded-xl ${isSubmitting ? 'loading' : ''}`}
   >
     {children}
   </button>

components/ui/forms/FormPageLayout.tsx

@@ -22,7 +22,7 @@ const FormPageLayout: FC<FormPageLayoutProps> = ({
     <div className="align-center my-20 flex h-fit flex-col items-center justify-center">
       <div className="w-8/12">
         <div className="tooltip tooltip-bottom absolute" data-tip={backLinkText}>
-          <Link href={backLink} className="btn btn-ghost btn-sm p-0">
+          <Link href={backLink} className="btn-ghost btn-sm btn p-0">
             <BiArrowBack className="text-xl" />
           </Link>
         </div>