fix: remove scroll-to-bottom requirement in redesigned transaction co…

…nfirmations (#27910)

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## **Description**
This PR addresses the removal of the scroll-to-bottom requirement in the
redesigned transaction confirmation screens. It eliminates the need for
users to scroll to the bottom in order to enable the confirm button,
streamlining the confirmation process. The scroll-to-bottom arrow is
also removed, ensuring a smoother user experience without unnecessary
interaction barriers.

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also include relevant motivation and context. Have in mind the following
questions:
1. What is the reason for the change?
2. What is the improvement/solution?
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## **Related issues**

Fixes: MetaMask/MetaMask-planning#3495

## **Manual testing steps**

1. Go to test dapp
2. Have 2+ transaction insights snaps installed
3. Click Create Token
4. See the confirm button disabled until you scroll to bottom 

## **Screenshots/Recordings**


[deploy.webm](https://github.com/user-attachments/assets/79716a68-e70f-456a-b962-ccec8732935b)


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before and after of your change. -->

### **Before**

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### **After**

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## **Pre-merge author checklist**

- [x] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask
Extension Coding
Standards](https://github.com/MetaMask/metamask-extension/blob/develop/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've completed the PR template to the best of my ability
- [x] I’ve included tests if applicable
- [x] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-extension/blob/develop/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

ui/pages/confirmations/components/confirm/scroll-to-bottom/scroll-to-bottom.test.tsx

@@ -2,7 +2,10 @@ import React from 'react';
 import configureMockStore from 'redux-mock-store';
 
 import { unapprovedTypedSignMsgV4 } from '../../../../../../test/data/confirmations/typed_sign';
-import { getMockPersonalSignConfirmState } from '../../../../../../test/data/confirmations/helper';
+import {
+  getMockContractInteractionConfirmState,
+  getMockPersonalSignConfirmState,
+} from '../../../../../../test/data/confirmations/helper';
 import { renderWithConfirmContextProvider } from '../../../../../../test/lib/confirmations/render-helpers';
 import * as usePreviousHooks from '../../../../../hooks/usePrevious';
 import ScrollToBottom from './scroll-to-bottom';
@@ -116,6 +119,16 @@ describe('ScrollToBottom', () => {
       expect(mockSetHasScrolledToBottom).toHaveBeenCalledWith(false);
     });
 
+    it('does not render the scroll button when the confirmation is transaction redesigned', () => {
+      const mockStateTransaction = getMockContractInteractionConfirmState();
+      const { container } = renderWithConfirmContextProvider(
+        <ScrollToBottom>foobar</ScrollToBottom>,
+        configureMockStore([])(mockStateTransaction),
+      );
+
+      expect(container.querySelector(buttonSelector)).not.toBeInTheDocument();
+    });
+
     describe('when user has scrolled to the bottom', () => {
       beforeEach(() => {
         mockedUseScrollRequiredResult.isScrolledToBottom = true;

ui/pages/confirmations/components/confirm/scroll-to-bottom/scroll-to-bottom.tsx

@@ -1,5 +1,6 @@
 import React, { useContext, useEffect } from 'react';
 import { useSelector } from 'react-redux';
+import { TransactionType } from '@metamask/transaction-controller';
 import {
   Box,
   ButtonIcon,
@@ -20,6 +21,7 @@ import { usePrevious } from '../../../../../hooks/usePrevious';
 import { useScrollRequired } from '../../../../../hooks/useScrollRequired';
 import { useConfirmContext } from '../../../context/confirm';
 import { selectConfirmationAdvancedDetailsOpen } from '../../../selectors/preferences';
+import { REDESIGN_DEV_TRANSACTION_TYPES } from '../../../utils';
 
 type ContentProps = {
   /**
@@ -49,6 +51,13 @@ const ScrollToBottom = ({ children }: ContentProps) => {
     offsetPxFromBottom: 0,
   });
 
+  const isTransactionRedesign = REDESIGN_DEV_TRANSACTION_TYPES.includes(
+    currentConfirmation?.type as TransactionType,
+  );
+
+  const showScrollToBottom =
+    isScrollable && !isScrolledToBottom && !isTransactionRedesign;
+
   /**
    * Scroll to the top of the page when the confirmation changes. This happens
    * when we navigate through different confirmations. Also, resets hasScrolledToBottom
@@ -71,8 +80,13 @@ const ScrollToBottom = ({ children }: ContentProps) => {
   }, [currentConfirmation?.id, previousId, ref?.current]);
 
   useEffect(() => {
+    if (isTransactionRedesign) {
+      setIsScrollToBottomCompleted(true);
+      return;
+    }
+
     setIsScrollToBottomCompleted(!isScrollable || hasScrolledToBottom);
-  }, [isScrollable, hasScrolledToBottom]);
+  }, [isScrollable, hasScrolledToBottom, isTransactionRedesign]);
 
   return (
     <Box
@@ -104,7 +118,7 @@ const ScrollToBottom = ({ children }: ContentProps) => {
       >
         {children}
 
-        {isScrollable && !isScrolledToBottom && (
+        {showScrollToBottom && (
           <ButtonIcon
             className="confirm-scroll-to-bottom__button"
             onClick={scrollToBottom}