feat(wallet): implement real EVM wallet connection lifecycle (V2-FE-006)

[abdullahilateefat03-boop]

closes #241

Summary

Implements V2-FE-006 — Real Wallet Connection Lifecycle for the
TruthBounty canonical Optimism/EVM runtime.

What changed

Replaced

• hooks/useWallet.ts — mock balance hook replaced with canonical EVM
  lifecycle hook: connect, reconnect, disconnect, account-change detection,
  connector-error state, hydration guard, connector-id preference persistence
• hooks/useAccount.ts — Stellar/Freighter implementation replaced with
  wagmi useAccount wrapper; hydration-safe (null before mount), exposes
  address, displayName, chainId
• components/features/claim-submission/ClaimSubmissionForm.tsx — removed
  @stellar/freighter-api setAllowed(); replaced with wagmi useConnect /
  useConnectors

Deleted

• lib/mock-wagmi.ts — removed; wagmi's built-in mock connector used in tests
• lib/mock-wallet-provider.tsx — removed; no synthetic wallet state remains
• lib/transaction-simulator.ts — removed; synthetic tx hashes are banned
  per spec; production paths use wagmi writeContract

Added

• src/__tests__/integration/wallet-lifecycle.test.tsx — integration tests
  at the Wagmi boundary: connect, disconnect, account-change, reconnect,
  wrong-network, hydration safety, no synthetic state

Tests updated

• hooks/tests/useWallet.test.tsx — lifecycle tests replacing mock balance tests
• hooks/__tests__/useAccount.test.ts — EVM tests replacing Freighter mocks
• ClaimSubmissionForm.wallet.test.tsx — wagmi connect mock replacing Freighter
• ClaimSubmissionForm.modal.test.tsx — Freighter mock removed

Acceptance criteria evidence

Criterion	Evidence
connect / reconnect / disconnect / account-change / connector-error	useWallet.ts + wallet-lifecycle.test.tsx
Hydration-safe, no phantom connected state	useIsMounted guard in useWallet + useAccount; hydration tests
Persist only minimal non-sensitive wallet preferences	connector id only written to localStorage (no address/key)
No synthetic production transaction or protocol state	transaction-simulator.ts deleted; mock-wagmi.ts deleted
No Stellar/Freighter runtime dependency in affected paths	setAllowed() removed from ClaimSubmissionForm; Freighter mocks purged from tests
No visual redesign	UI components untouched

Security notes

• Only the connector id (e.g. "injected") is written to localStorage
• No addresses, keys, balances, or hashes are persisted
• On-chain reads remain routed through lib/contracts/registry.ts

Residual risks

• @stellar/freighter-api and @stellar/stellar-sdk remain in package.json
  as transitive entries; they can be removed with pnpm remove once
  confirmed no other feature branch depends on them

[dDevAhmed]

resolve conflicts @abdullahilateefat03-boop