feat: show private key list as full screen

[gantunesr]

Description

The multichain private key list previously used a BottomSheet and transparent modal presentation. It now uses the same full-screen pattern as Address List: HeaderCompactStandard via useLayoutEffect / navigation.setOptions, a flex root, and slide-in card options on the parent stack screen.

Cancel uses navigation.goBack() instead of closing a sheet. BottomSheet-specific code (gesture scroll ref context, RNGH ScrollView wrapper for FlashList, panGestureHandlerProps) was removed.

Changelog

CHANGELOG entry: Updated multichain private key list to open as a full screen instead of a bottom sheet

Related issues

Fixes:

Manual testing steps

Feature: Multichain private key list full screen

  Scenario: Open private key list from account group
    Given the user is on multichain account group details with a wallet that supports exported keys

    When the user opens the private key list flow and enters the wallet password
    Then the screen is full screen with a back control in the header and the address list scrolls as expected

    When the user taps Cancel before unlocking
    Then the app navigates back to the previous screen

Screenshots/Recordings

Before

N/A

After

Screen.Recording.2026-04-10.at.9.57.29.PM.mov

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards.
• I've completed the PR template to the best of my ability
• I've included tests if applicable
• I've documented my code using JSDoc format if applicable
• I've applied the right labels on the PR (see labeling guidelines). 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.

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Note

Medium Risk
Changes navigation/presentation for the private key export flow, which is security-sensitive UX, and could impact back navigation/animations across platforms. No changes to key export/verification logic, so risk is mainly in routing and layout behavior.

Overview
Updates the multichain private key list flow to open as a full-screen card instead of a bottom sheet/transparent modal.

The PrivateKeyList view now configures a standard header via navigation.setOptions (including a dedicated back button testID) and uses navigation.goBack() for cancel/back behavior, removing all BottomSheet/gesture-scroll plumbing.

The parent navigator route for Routes.MULTICHAIN_ACCOUNTS.PRIVATE_KEY_LIST is updated to use an explicit slide-in card animation and non-transparent background, matching the full-screen presentation.

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✅ E2E Fixture Validation — Schema is up to date
17 value mismatches detected (expected — fixture represents an existing user).
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Quality Gate failed

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