refactor(auth): replace anchor navigation links with Button components and improve auth page styling

src/shared/components/Button.js

@@ -27,29 +27,29 @@ const Button = ({
     };
 
     const sizes = {
-        sm: '',
+        sm: 'px-[10px] py-[5px] text-[12px] gap-1',
         md: 'px-[12px] py-[7px] text-[13px] gap-1.5',
-        lg: ''
+        lg: 'px-[14px] py-[9px] text-[14px] gap-2'
     };
 
     const iconOnlySizes = {
-        sm: '',
+        sm: 'p-[5px] text-[12px]',
         md: 'p-[7px] text-[13px]',
-        lg: ''
+        lg: 'p-[9px] text-[14px]'
     };
 
     const isIconOnly = icon && !children;
-    
+
     const iconSizes = {
-        sm: '',
+        sm: 'w-3.5 h-3.5',
         md: 'w-4 h-4',
-        lg: ''
+        lg: 'w-4.5 h-4.5'
     };
 
     const textSizes = {
-        sm: '',
+        sm: 'min-h-3.5',
         md: 'min-h-4',
-        lg: ''
+        lg: 'min-h-4.5'
     };
 
     const LoadingSpinner = () => (