chore: remove legacy accounts component code (pre BIP-44)

[gantunesr]

Description

This PR removes the usage of the selector selectMultichainAccountsState2Enabled which gets the value for the BIP-44 feature flag. Moving forward, BIP-44 is the default behaviour and any alternative logic branch will be remove alongside tests.

The scope of the changes is limited to files inside the app/components/UI/ directory.

Changelog

CHANGELOG entry: null

Related issues

Fixes: https://consensyssoftware.atlassian.net/browse/MUL-1382

Manual testing steps

Not applicable

Screenshots/Recordings

Not applicable

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

Medium Risk
Removes legacy/flagged UI branches and changes user-visible behavior (e.g., AddressCopy no longer copies to clipboard and network selector defaults/sections change). Moderate risk of regressions in navigation, balance display, and tests due to widened unconditional paths.

Overview
Standardizes UI on multichain/BIP-44 behavior by removing selectMultichainAccountsState2Enabled gating.

AddressCopy is simplified to no longer accept an account prop and no longer performs clipboard/toast/metrics/protect-wallet logic; pressing the icon now always navigates to the multichain address list (updated call sites in Navbar and AccountInfo, plus a simplified test).

Network selection UI is de-flagged: NetworkManager’s initial tab selection is now derived solely from enabledNetworksByNamespace, NetworkMultiSelector always renders the custom network section for any namespace, and NetworkMultiSelectorList always prepends the “select all networks” row when provided.

AssetOverview drops the state2-specific balance shortcut and always uses asset.balance when present; tests are updated accordingly (mock selectors refactor, Solana balance expectation, and an updated “no balance” scenario).

^{Written by Cursor Bugbot for commit 0516e6e. This will update automatically on new commits. Configure here.}

[codecov-commenter]

Codecov Report

❌ Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.26%. Comparing base (93fba69) to head (0516e6e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
app/components/UI/NetworkManager/index.tsx	25.00%	2 Missing and 1 partial ⚠️
...workMultiSelectorList/NetworkMultiSelectorList.tsx	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #24886      +/-   ##
==========================================
+ Coverage   75.42%   80.26%   +4.84%     
==========================================
  Files        4263     4263              
  Lines      110111   110086      -25     
  Branches    23462    23456       -6     
==========================================
+ Hits        83051    88364    +5313     
+ Misses      21036    15519    -5517     
- Partials     6024     6203     +179     

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[gantunesr]

Won't fix the quality gate failure since this is not introducing any new code

[sahar-fehri]

Assets changes LGTM ✅

[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

[github-actions]

🔍 Smart E2E Test Selection

⏭️ Smart E2E selection skipped - skip-smart-e2e-selection label found

All E2E tests pre-selected.

View GitHub Actions results

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
90.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud