fix: Implement nonEVM zero balance check to send flow before onAmountInput

[OGPoyraz]

Description

Changelog

This PR adds zero balance check before onAmountInput RPC call to nonEVM send flow amount validations.

CHANGELOG entry: null

Related issues

Fixes: #22812

Manual testing steps

1. Go to send flow
2. Don't have any Tron / SOL / BTC
3. Try sending it but see "insufficient balance" error

Screenshots/Recordings

Before

After

implement.zero.balance.check.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.

---

Note

Adds a zero-balance pre-check for non-EVM assets in amount validation and updates tests to cover it.

• Validation (useAmountValidation):
  • Add non-EVM pre-check rawBalanceBN.isZero() to return "send.insufficient_funds" before onAmountInput snap validation in useAmountValidation.ts.
  • Update hook dependencies to include rawBalanceBN.
• Tests:
  • Extend useAmountValidation.test.ts with SOLANA mocks and a test asserting error when non-EVM asset balance is zero.

^{Written by Cursor Bugbot for commit bf695af. This will update automatically on new commits. Configure here.}

[github-actions]

🔍 Smart E2E Test Selection

• Selected E2E tags: SmokeAccounts, SmokeCore, SmokeConfirmationsRedesigned, SmokeIdentity, SmokeNetworkAbstractions, SmokeNetworkExpansion, SmokeTrade, SmokeWalletPlatform, SmokeWalletUX, SmokeAssets, SmokeSwaps, SmokeStake, SmokeCard, SmokeNotifications, SmokeRewards, SmokePerps, SmokeRamps, SmokeMultiChainPermissions, SmokeAnalytics, SmokeMultiChainAPI, SmokePredictions
• Risk Level: high
• AI Confidence: %

click to see 🤖 AI reasoning details

Fallback: AI analysis did not complete successfully. Running all tests.

View GitHub Actions results

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud