[investorUsman]

Resolves #863
Resolves #867
Resolves #868

Summary

This PR addresses the three remaining assigned issues in one comprehensive change set. Several pieces of the underlying work had already landed on main under earlier issue numbers (#732 and #737), so this PR hardens the persistence logic and extends the existing screen/dashboard test files to explicitly cover every acceptance criterion.

Changes

#863 — ContractEventFeed: preserve fromLedger across remounts

• Hardened readPersistedFromLedger so corrupted, non-numeric, or negative sessionStorage values are ignored instead of being forwarded to getEvents(...) as NaN.
• Guarded persistFromLedger against non-finite/negative ledger values.
• Added regression tests covering:
  • The next ledger is persisted under the contract-specific sessionStorage key.
  • The previous contract's persisted key is removed when contractId changes.
  • A corrupted persisted value falls back to the default window rather than sending NaN.
  • Existing unmount/remount and explicit fromLedger precedence tests continue to pass.

#867 — NFTScreen tests

• Extended NFTScreen.test.tsx to cover the loading, error, empty, and success states (already present) plus:
  • nft.getNfts is called with the connected wallet address.
  • The disconnected wallet prompt is rendered.
• Uses createMockClient() from src/lib/mock-client.ts.

#868 — StakingDashboard tests

• Extended StakingDashboard.test.tsx using the createMockClient() pattern in the mocked context.
• Added coverage for applying an inline delegation adjustment (delegated total updates and refreshAccount is invoked).
• handleClaimAll now refreshes the connected account after a successful claim so balances propagate outside the dashboard; the claim-all test asserts that refresh.
• Existing validator rendering, delegation-form, rewards-total, and claim-all behaviour tests remain intact.

Testing

• Full Vitest suite: 100 test files passed, 2039 tests passed
• npx eslint on all changed files: clean
• npx tsc -b --noEmit: clean

Notes

No unrelated files are included in this PR.

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