Replace bs58 with @scure/base for Base58 encoding/decoding

[devin-ai-integration]

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Description

This PR replaces the bs58 dependency with @scure/base for all Base58 encoding/decoding operations in the @walletconnect/utils package. The change standardizes on @scure/base which is already present in the dependency list and provides equivalent Base58 functionality.

Key changes:

• Updated imports in packages/utils/src/signatures.ts and packages/utils/src/polkadot.ts
• Replaced bs58.encode() calls with base58.encode() (affects Solana, SUI, and NEAR transaction ID generation)
• Replaced bs58.decode() calls with base58.decode() (affects Polkadot SS58 address decoding)
• Removed bs58 dependency from packages/utils/package.json
• Consolidated imports in signatures.ts to import both base58 and base32 from @scure/base

Type of change

• Chore (non-breaking change that addresses non-functional tasks, maintenance, or code quality improvements)

How has this been tested?

• ✅ All existing unit tests pass for the utils package
• ✅ Lint and build checks pass
• ✅ Verified no other bs58 usages exist in the codebase
• ✅ Both bs58 (v6.0.0) and @scure/base (v1.2.6) have compatible APIs for our use cases

Functions tested:

• Solana transaction ID extraction (extractSolanaTransactionId)
• SUI digest generation (getSuiDigest)
• NEAR transaction ID generation (getNearTransactionIdFromSignedTransaction)
• Polkadot SS58 address decoding (ss58AddressToPublicKey)
• Polkadot signature type detection (guessSignatureTypeFromAddress)

Fixes/Resolves (Optional)

Resolves Linear ticket CR-658

Checklist

• I have performed a self-review of my own code
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

Additional Information (Optional)

⚠️ Important for Reviewers:

Please pay special attention to:

1. API Compatibility: While both libraries implement Base58 encoding, please verify that error handling and edge cases behave identically
2. Blockchain Operations: The affected functions handle critical blockchain operations (transaction IDs, address decoding) - any encoding differences could impact functionality
3. Test Coverage: Existing tests should provide adequate coverage, but consider if additional edge case testing is needed

Link to Devin run: https://app.devin.ai/sessions/9988c95fdaeb42f58ad2e348c8c966d3

Requested by: Ben Kremer (@bkrem)

[linear]

CR-658 `bs58` module can be replaced with `@scure/base`

[devin-ai-integration]

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[Copilot]

Pull Request Overview

This PR replaces the bs58 dependency with @scure/base for Base58 encoding/decoding operations across the WalletConnect utils package. The change consolidates dependencies by using the already-present @scure/base library instead of maintaining a separate bs58 dependency.

• Updated Base58 encoding/decoding calls in blockchain transaction processing functions
• Consolidated imports to use @scure/base for both base58 and base32 operations
• Removed unused bs58 dependency from package.json

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

File	Description
packages/utils/test/signatures.spec.ts	Removed unused import buildSignedExtrinsic
packages/utils/src/signatures.ts	Updated imports and replaced bs58 calls with base58 for Solana, SUI, and NEAR operations
packages/utils/src/polkadot.ts	Updated imports and replaced bs58 calls with base58 for Polkadot address decoding
packages/utils/package.json	Removed bs58 dependency

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[bkrem]

rebase and resolve conflicts