refactor: modularize useWallet

[alanrsoares]

Summary

Refactored wallet integration to improve modularity and maintainability. Key updates include:

• Introduced a WalletType type alias for safer and clearer wallet references.
• Extracted wallet-specific logic (connect, sign) into modular adapter files (keplr, leap, cosmostation) under wallet/adapters/.
• Modularized transaction, sequence, and authentication logic into dedicated files:
  • transactions.ts, sequence.ts, auth.ts, signing.ts, dither.ts
• Simplified and cleaned up useWallet by delegating responsibilities to these modules.
• Updated WalletConnectDialog.vue to use WalletType.

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[salmad3]

The refactor is a great improvement.

(Not necessarily for this PR) Noticed the error handling is not consistent. For instance, the auth module catches errors and logs to console, the wallet adapters throw errors, and the transaction module is a mix of throwing and returning error responses.

The modular structure is solid for unit testing, but currently there aren't test files for the new modules.