feat: Add tokens full page

[brianacnguyen]

Description

This PR adds the Tokens Full page to the wallet

Changelog

CHANGELOG entry: null

Related issues

Fixes: https://consensyssoftware.atlassian.net/jira/software/c/projects/DSYS/boards/1888?selectedIssue=DSYS-245

Manual testing steps

Feature: Tokens Full Page

  Scenario: user: null
    Given: null

    When user uncomments line 265 in `app/components/UI/Tokens/index.tsx` and clicks on View all Tokens
    Then it should lead them to the Tokens Full View page with a full view of tokens with preexisting behaviors still intact

Screenshots/Recordings

Before

After

Tokens Full View

Simulator.Screen.Recording.-.iPhone.15.Pro.Max.-.2025-10-24.at.09.18.25.mp4

Tokens Tab still functional

Simulator.Screen.Recording.-.iPhone.15.Pro.Max.-.2025-10-24.at.09.19.46.mp4

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.

---

Note

Adds a new full-screen Tokens view with navigation route and tests, removes the token list footer, enables control bar/list styling props, and switches AddAsset to a bottom-sheet header.

• Wallet UI:
  • New TokensFullView screen: Full-screen tokens list with progressive loading, control bar, and back header (app/components/Views/TokensFullView/*).
  • Navigation: Registers route Routes.WALLET.TOKENS_FULL_VIEW and screen in MainNavigator.
  • Localization: Adds wallet.view_all_tokens string.
• Tokens list refactor:
  • Removes TokenListFooter component and its tests/snapshots.
  • TokenList: adds optional flashListProps passthrough; removes ListFooterComponent usage.
  • TokenListControlBar and BaseControlBar: add optional style prop for layout customization.
  • Styles: add viewAllTokensButton.
• AddAsset UX:
  • Replaces nav bar options with BottomSheetHeader and back handling in AddAsset.

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[github-actions]

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[brianacnguyen]

The Import assets page was moved to the main stack to work with both the Tokens tab and tokens full page, so the header needs to be refactored to go inside the page