Better Auth Plugin for Solana Sign-In

better-auth-solana is a specialized plugin for the Better Auth authentication framework, designed to facilitate "Sign in With Solana" (SIWS) functionality. Currently at version 1.0.0, it provides a stable, initial release enabling Solana wallet integration into Better Auth applications. The package includes server-side endpoints for managing the SIWS flow (nonce generation, signature verification, wallet linking) and client-side utilities for constructing SIWS messages and interacting with the Better Auth client. It natively handles session establishment and account creation/linking within the Better Auth ecosystem, using its dedicated `siws` plugin namespace. The package is published as ESM-only, aligning with better-auth's modern module strategy.