test(wallet): cover creator 404, activity ordering, holdings total updates, and disconnect session logging

[Calebux]

Closes #656
Closes #658
Closes #659
Closes #660

Summary

This PR covers four related marketplace and wallet reliability issues:

• adds a distinct creator not-found state for 404 creator profile responses
• adds integration coverage for wallet activity ordering and Buy/Sell labels
• adds structured debug logging for wallet disconnect session duration
• adds integration coverage for holdings grand total updates after a confirmed buy

What changed

#656 Creator profile 404 state

• added canonical /creator/:id route support while keeping existing creator detail routing
• preserved API 404 errors in the creator detail flow instead of collapsing them into a generic failure
• updated the creator page error boundary to render a dedicated not-found state with a back-to-creators action
• added an integration test asserting:
  • not-found state is shown for a 404 response
  • loading skeleton is gone after resolution
  • generic error copy is not shown
  • back-to-creators navigation is present

#658 Wallet activity feed ordering

• updated TransactionHistory to sort entries in descending timestamp order before rendering
• added an integration test asserting:
  • trades render in reverse chronological order
  • Buy and Sell labels are correct
  • creator handles and trade amounts are visible for each entry

#659 Wallet disconnect session logging

• added a reusable wallet disconnect log helper
• record connect time while the wallet session is active
• emit a structured debug log on disconnect with:
  • truncated_address
  • session_duration_ms
  • disconnected_at
• ensured the full wallet address is not logged
• ensured the disconnect log is suppressed in the test environment
• added unit/integration coverage for the log payload and environment guard

#660 Holdings grand total live update

• added an integration test that simulates a confirmed buy updating the holdings cache
• asserted the holdings total updates from 500 XLM to 700 XLM without reload
• asserted the new holding entry becomes visible alongside the existing one

Validation

• pnpm vitest run src/pages/__tests__/CreatorDetailPage.integration.test.tsx src/components/common/__tests__/TransactionHistory.order.integration.test.tsx src/components/common/__tests__/ConnectWalletButton.test.tsx src/lib/__tests__/walletSessionLog.test.ts src/pages/__tests__/LandingPage.holdingsGrandTotal.integration.test.tsx --reporter=dot
• pnpm lint
• pnpm build

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