Add/update Solana Wallet Adapter docs

[alexandratran]

Description

Update placeholder Solana Wallet Adapter docs. Use simpler, easy-to-follow MetaMask-specific format.

• Use the Wallet Adapter
• Send a legacy transaction
• Send a versioned transaction

Preview

https://metamask-docs-c5mrab2yg-consensys-ddffed67.vercel.app/sdk/solana/

Checklist

• If this PR updates or adds documentation content that changes or adds technical meaning, it has received an approval from an engineer or DevRel from the relevant team.
• If this PR updates or adds documentation content, it has received an approval from a technical writer.

---

Note

Revamps Solana docs with Wallet Adapter setup and MetaMask-based legacy/versioned transaction guides (including ALT usage), plus index and libraries list updates.

• Guides:
  • Send legacy transaction (sdk/solana/connect/guides/send-legacy-transaction.md):
    • Rewritten for MetaMask; adds tabbed examples for signAndSendTransaction and request.
    • Documents optional SendOptions and multi-tx flow via signAndSendAllTransactions with code snippets.
    • Removes older/non-recommended signing methods sections.
  • Send versioned transaction (sdk/solana/connect/guides/send-versioned-transaction.md):
    • Rewritten for MetaMask; clarifies v0 vs legacy and shows creating, signing, and sending.
    • Adds detailed ALT coverage: create, extend, fetch, read, and use in a v0 transaction.
• Wallet Adapter (sdk/solana/connect/guides/use-wallet-adapter.md):
  • New step-by-step setup: install deps, implement SolanaProvider, and wrap app, with React/TS snippets.
• Index (sdk/solana/index.md):
  • Updates Wallet Standard link to Wallet Adapter repo path and tightens wording.
  • Updates third-party libraries list (adds Embedded Wallets, removes Web3Auth).

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Project	Deployment	Preview	Comments	Updated (UTC)
metamask-docs	Ready	Preview	Comment	Nov 6, 2025 8:37pm

[shahbaz17]

lgtm