feat(react-hooks): add useClassifiedTransactions hook

[cxalem]

Integrate tx-indexer SDK to provide transaction classification, protocol detection, spam filtering, and token metadata enrichment.

Features:

• Transaction classification (swap, transfer, stake, NFT, etc.)
• Protocol detection (Jupiter, Raydium, etc.)
• Automatic spam filtering
• Token metadata enrichment
• Cursor-based pagination with oldestSignature/hasMore
• Auto cluster detection from RPC endpoint URL
• Rate-limit friendly defaults for public RPCs

Also adds example component ClassifiedTransactionsCard to vite-react demo.

const { transactions, oldestSignature, hasMore, isLoading } = useClassifiedTransactions({
  address: walletAddress,
  options: { limit: 10 },
});

Summary

• Add useClassifiedTransactions hook to @solana/react-hooks
• Add tx-indexer@^1.3.2 dependency
• Export tx-indexer types (ClassifiedTransaction, Cluster, TokenInfo, etc.)
• Add example component and tests

Testing

• pnpm lint
• pnpm test
• pnpm build
• Other (describe):

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[GuiBibeau]

@cxalem this is a great PR! Can you please verify two thigns:

• Is there an increase to bundle size?
• please make docs in both the readmes to show examples and in the docs site

[cxalem]

@cxalem this is a great PR! Can you please verify two thigns:

• Is there an increase to bundle size?
• please make docs in both the readmes to show examples and in the docs site

1.- Yes, since tx-indexer is listed as a dependency, it increased by 1.34 KB!
2.- Working on it!