fix: keyboard pushing screen up during password input (#16898)

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## **Description**

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also include relevant motivation and context. Have in mind the following
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1. What is the reason for the change?
2. What is the improvement/solution?
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This PR fixes the issue where the keyboard would push screen up instead
of overlaying.

## **Related issues**

Fixes:
https://consensyssoftware.atlassian.net/browse/MUL-321?atlOrigin=eyJpIjoiMDAzNzY3N2IzZGRhNGI2MDgyMTA2MjQyM2Q4ZDY1YTUiLCJwIjoiaiJ9

## **Manual testing steps**

1. Enable multichain account design
2. Go to account details
3. Click to reveal private key
4. Click on the input and trigger the software keyboard
5. See that the screen is not being pushed up. 

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

<!-- [screenshots/recordings] -->


https://github.com/user-attachments/assets/e0d8cb1e-9b1e-49a6-8a25-5124399a97ba




### **After**



https://github.com/user-attachments/assets/fe7df495-857b-4be6-b0c0-7fbbc5f579ed



<!-- [screenshots/recordings] -->

## **Pre-merge author checklist**

- [x] I’ve followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.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
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if applicable
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guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.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.

Author: montelaidev

app/components/Views/MultichainAccounts/sheets/RevealPrivateKey/RevealPrivateKey.styles.ts

@@ -3,9 +3,7 @@ import { StyleSheet } from 'react-native';
 const styleSheet = () =>
   StyleSheet.create({
     container: {
-      marginBottom: 36,
-      paddingLeft: 24,
-      paddingRight: 24,
+      flex: 1,
     },
   });
 

app/components/Views/MultichainAccounts/sheets/RevealPrivateKey/RevealPrivateKey.test.tsx

@@ -1,26 +1,12 @@
 import React from 'react';
 import { fireEvent } from '@testing-library/react-native';
-import { TouchableOpacity } from 'react-native';
 import { RevealPrivateKey } from './RevealPrivateKey';
 import { internalAccount1 as mockAccount } from '../../../../../util/test/accountsControllerTestUtils';
 import { KeyringTypes } from '@metamask/keyring-controller';
 import { strings } from '../../../../../../locales/i18n';
-import { SafeAreaProvider } from 'react-native-safe-area-context';
 import renderWithProvider from '../../../../../util/test/renderWithProvider';
 import { backgroundState } from '../../../../../util/test/initial-root-state';
-
-jest.mock('react-native-safe-area-context', () => {
-  const inset = { top: 0, right: 0, bottom: 0, left: 0 };
-  const frame = { width: 0, height: 0, x: 0, y: 0 };
-  return {
-    SafeAreaProvider: jest.fn().mockImplementation(({ children }) => children),
-    SafeAreaConsumer: jest
-      .fn()
-      .mockImplementation(({ children }) => children(inset)),
-    useSafeAreaInsets: jest.fn().mockImplementation(() => inset),
-    useSafeAreaFrame: jest.fn().mockImplementation(() => frame),
-  };
-});
+import { SHEET_HEADER_BACK_BUTTON_ID } from '../../../../../component-library/components/Sheet/SheetHeader/SheetHeader.constants';
 
 const mockGoBack = jest.fn();
 const mockNavigate = jest.fn();
@@ -82,12 +68,7 @@ const render = () => {
       },
     },
   };
-  return renderWithProvider(
-    <SafeAreaProvider>
-      <RevealPrivateKey />
-    </SafeAreaProvider>,
-    { state: initialState },
-  );
+  return renderWithProvider(<RevealPrivateKey />, { state: initialState });
 };
 
 describe('RevealPrivateKey', () => {
@@ -123,15 +104,8 @@ describe('RevealPrivateKey', () => {
   });
 
   it('navigates back when the back button is pressed', () => {
-    const rendered = render();
-    const { root } = rendered;
-    const touchableOpacities = root.findAllByType(TouchableOpacity);
-
-    // Hack to get the button
-    const backButton = touchableOpacities.find(
-      (touchable) =>
-        touchable.props.accessible === true && touchable.props.onPress,
-    );
+    const { getByTestId } = render();
+    const backButton = getByTestId(SHEET_HEADER_BACK_BUTTON_ID);
 
     expect(backButton).toBeTruthy();
     if (backButton) {

app/components/Views/MultichainAccounts/sheets/RevealPrivateKey/RevealPrivateKey.tsx

@@ -1,19 +1,18 @@
 import React from 'react';
 import { strings } from '../../../../../../locales/i18n';
-import BottomSheet from '../../../../../component-library/components/BottomSheets/BottomSheet';
 import { InternalAccount } from '@metamask/keyring-internal-api';
 import {
   ParamListBase,
   RouteProp,
   useNavigation,
   useRoute,
 } from '@react-navigation/native';
-import Text, {
-  TextVariant,
-} from '../../../../../component-library/components/Texts/Text';
-import BottomSheetHeader from '../../../../../component-library/components/BottomSheets/BottomSheetHeader';
 import { RevealPrivateCredential } from '../../../RevealPrivateCredential';
 import { PRIVATE_KEY } from '../../../RevealPrivateCredential/RevealPrivateCredential';
+import SheetHeader from '../../../../../component-library/components/Sheet/SheetHeader';
+import { SafeAreaView } from 'react-native-safe-area-context';
+import styleSheet from './RevealPrivateKey.styles';
+import { useStyles } from '../../../../hooks/useStyles';
 
 interface RootNavigationParamList extends ParamListBase {
   RevealPrivateKey: {
@@ -27,6 +26,7 @@ type RevealPrivateKeyProp = RouteProp<
 >;
 
 export const RevealPrivateKey = () => {
+  const { styles } = useStyles(styleSheet, {});
   const navigation = useNavigation();
   const route = useRoute<RevealPrivateKeyProp>();
   const { account } = route.params;
@@ -35,12 +35,11 @@ export const RevealPrivateKey = () => {
   };
 
   return (
-    <BottomSheet isFullscreen>
-      <BottomSheetHeader onBack={handleOnBack}>
-        <Text variant={TextVariant.HeadingMD}>
-          {strings('multichain_accounts.reveal_private_key.title')}
-        </Text>
-      </BottomSheetHeader>
+    <SafeAreaView style={styles.container}>
+      <SheetHeader
+        onBack={handleOnBack}
+        title={strings('multichain_accounts.reveal_private_key.title')}
+      />
       <RevealPrivateCredential
         credentialName={PRIVATE_KEY}
         navigation={navigation}
@@ -55,6 +54,6 @@ export const RevealPrivateKey = () => {
           },
         }}
       />
-    </BottomSheet>
+    </SafeAreaView>
   );
 };