feat: Support staking

[letonchanh]

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[vercel]

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Project	Deployment	Review	Updated (UTC)
vana-console	Ready	Preview	Jan 8, 2026 1:40am
vana-rbac-auditor	Ready	Preview	Jan 8, 2026 1:40am
vana-vibes-demo	Ready	Preview	Jan 8, 2026 1:40am

[github-actions]

• packages/vana-sdk/src/controllers/staking.ts:553-595 & 685-723 – stake/unstake only check that a wallet client exists and then fall back to userAddress if no account is configured. If a wallet client is present but lacks an account (common when a viem wallet is constructed without one), writeContract will throw “No account provided” or attempt to sign with an address the client can't use. Use assertWallet() (or otherwise require a connected account) and avoid the userAddress fallback for signing to prevent confusing runtime failures.
• packages/vana-sdk/src/controllers/staking.ts:495 – Scaling uses BigInt(1e18) derived from a JS number literal above the safe integer range; at that magnitude increments aren’t representable, so the conversion depends on a rounded value. Using a BigInt literal (10n ** 18n) would avoid precision risk in currentValue/reward math.
• packages/vana-sdk/src/controllers/staking.ts:553-595 – stake doesn’t accept TransactionOptions/spreadTransactionOptions like unstake does, so callers can’t override gas/nonce/fees when estimation is off. Consider adding an optional options argument for parity and to reduce failed transactions.