fix(react-native): add useSolanaWallet to value exports

[jose-compu]

Summary

• useSolanaWallet was missing from the named value export list in @account-kit/react-native, causing TS1362: 'useSolanaWallet' cannot be used as a value because it was exported using 'export type'.
• The hook was only re-exported via export type * from "@account-kit/react/hooks", making it available as a type but not as a callable runtime value.
• Added useSolanaWallet to the explicit export { ... } block in account-kit/react-native/src/index.ts.

Fixes #2307

Test plan

• Built @account-kit/react-native and verified useSolanaWallet appears in the value export statement of dist/types/index.d.ts (not only as a type export).
• Confirmed useSolanaWallet is present in the ESM output (dist/esm/index.js).
• Verified that before this change, the symbol was absent from both outputs.
• Prettier passes. ESLint blocked repo-wide by missing OPENAI_API_KEY in ESLint plugin (unrelated).
• Commit message validated with commitlint.

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PR-Codex overview

This PR introduces a new hook to the index.ts file in the account-kit/react-native/src directory, enhancing the functionality related to Solana wallet integration.

Detailed summary

• Added useSolanaWallet to the exports from @account-kit/react/hooks.

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Pull request overview

This PR fixes a TypeScript export issue where useSolanaWallet hook was only available as a type export in @account-kit/react-native, causing runtime errors when developers tried to use it. The hook was missing from the explicit value export list, making it unusable despite being needed for Solana wallet functionality.

Changes:

• Added useSolanaWallet to the named value export list in account-kit/react-native/src/index.ts, placing it in correct alphabetical order between useSolanaTransaction and useUser