🎨 Update theme (#666)

frontend/src/components/Admin/AddUser.tsx

@@ -174,13 +174,7 @@ const AddUser: React.FC<AddUserProps> = ({ isOpen, onClose }) => {
             </Flex>
           </ModalBody>
           <ModalFooter gap={3}>
-            <Button
-              bg="ui.main"
-              color="white"
-              _hover={{ opacity: 0.8 }}
-              type="submit"
-              isLoading={isSubmitting}
-            >
+            <Button variant="primary" type="submit" isLoading={isSubmitting}>
               Save
             </Button>
             <Button onClick={onClose}>Cancel</Button>

frontend/src/components/Admin/EditUser.tsx

@@ -163,9 +163,7 @@ const EditUser: React.FC<EditUserProps> = ({ user, isOpen, onClose }) => {
 
           <ModalFooter gap={3}>
             <Button
-              bg="ui.main"
-              color="white"
-              _hover={{ opacity: 0.8 }}
+              variant="primary"
               type="submit"
               isLoading={isSubmitting}
               isDisabled={!isDirty}