feat: implement smart contract wallet with account abstraction and ga…

[chidii]

Closes #403

What this PR does
Implements smart contract wallets with account abstraction, multi-signature support, session keys, wallet recovery, and gas sponsorship via paymaster.

Files

• contracts/src/smart_wallet.rs — Multi-sig wallet with threshold signatures, session keys, recovery via guardian
• contracts/src/paymaster.rs — Gas sponsorship with per-wallet limits, cost calculation, reimbursement tracking
• frontend/src/components/wallet/WalletDashboard.tsx — Wallet creation, transaction execution, gas sponsorship view, session keys

Acceptance Criteria

• ✅ Wallets created with custom logic (multi-sig, threshold)
• ✅ Account abstraction functional (session keys, custom auth)
• ✅ Gas sponsorship works (paymaster with limits)
• ✅ Recovery mechanisms secure (guardian + delay)
• ✅ Frontend manages wallet seamlessly
• ✅ All operations emit proper events

/claim #403

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[ayomideadeniran]

pr under review, if i find any wrong implementation i will notify you.

[ayomideadeniran]

pr under review, if i find any wrong implementation i will notify you.

[ayomideadeniran]

pr under review, if i find any wrong implementation i will notify you.