refactor: Update mainnet RPC API URL to use new endpoint

[askov]

Description

Updates the Solana mainnet RPC URL from api.mainnet-beta.solana.com to api.mainnet.solana.com. Also adds unit tests for modifyUrl.

The follow-up task

Type of change

• Other (please describe): Change mainnet RPC url

Testing

• Tests should pass

Related Issues

Closes HOO-221

Checklist

• My code follows the project's style guidelines
• I have added tests that prove my fix/feature works
• All tests pass locally and in CI
• CI/CD checks pass

[vercel]

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[greptile-apps]

Greptile Overview

Greptile Summary

This PR updates the Solana mainnet RPC URL from api.mainnet-beta.solana.com to api.mainnet.solana.com across the codebase. The changes include:

• Updated MAINNET_BETA_URL constant in app/utils/cluster.ts
• Exported modifyUrl function to enable unit testing
• Added comprehensive unit tests for modifyUrl function in app/utils/__tests__/cluster.test.ts
• Updated Python script fetch_mainnet_activations.py to use new endpoint

The changes are clean and well-tested. However, several test files and documentation still reference the old URL and should be updated for complete consistency:

• app/features/security-txt/model/__tests__/useSecurityTxt.spec.ts
• app/components/inspector/__tests__/InspectorPage.spec.tsx
• app/components/account/__tests__/AccountHeader.spec.tsx
• CONTRIBUTING.md

Confidence Score: 4/5

• This PR is safe to merge with minor documentation and test cleanup recommended
• Score reflects well-structured changes with good test coverage, but several test files and documentation still reference the old URL which should be updated for consistency
• All files are safe, but check that test files and documentation referencing old URL are updated

Important Files Changed

Filename	Overview
app/utils/cluster.ts	Updated MAINNET_BETA_URL from api.mainnet-beta.solana.com to api.mainnet.solana.com and exported modifyUrl function for testing
app/utils/tests/cluster.test.ts	Added comprehensive unit tests for modifyUrl function covering localhost and non-localhost scenarios
scripts/fetch_mainnet_activations.py	Updated AsyncClient connection URL to use new mainnet endpoint

Sequence Diagram

sequenceDiagram
    participant App as Explorer App
    participant ClusterUtils as cluster.ts
    participant ModifyURL as modifyUrl()
    participant RPC as RPC Endpoint
    
    Note over ClusterUtils: MAINNET_BETA_URL updated<br/>from api.mainnet-beta.solana.com<br/>to api.mainnet.solana.com
    
    App->>ClusterUtils: Request cluster URL
    ClusterUtils->>ModifyURL: modifyUrl(MAINNET_BETA_URL)
    
    alt hostname === 'localhost'
        ModifyURL-->>ClusterUtils: Return unchanged URL<br/>https://api.mainnet.solana.com
    else hostname !== 'localhost'
        ModifyURL-->>ClusterUtils: Return modified URL<br/>https://explorer-api.mainnet.solana.com
    end
    
    ClusterUtils-->>App: Return final URL
    App->>RPC: Connect to RPC endpoint
    RPC-->>App: RPC connection established

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[greptile-apps]

_{3 files reviewed, 1 comment}

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[greptile-apps]

Check that test files still referencing api.mainnet-beta.solana.com are updated:

• app/features/security-txt/model/__tests__/useSecurityTxt.spec.ts:16
• app/components/inspector/__tests__/InspectorPage.spec.tsx:142
• app/components/account/__tests__/AccountHeader.spec.tsx:16
• CONTRIBUTING.md:31

[askov]

Not yet, there are a lot of changes required. The goal here is to make it work.

[rogaldh]

Yeah. There will be a consecutive task with changes in the whole project. Agreed.

[rogaldh]

LGTM

We are waiting for Alpenglow to be released.