fix(match,wallet): remove silent mock fallback and add token expiry guard

[Mansa147]

closes #736
closes #737

• Remove try/catch mock-data fallback from useMatch queryFn; API errors now surface naturally via TanStack Query isError
• Match detail page keyed on isError with dedicated error UI and Retry button; null-data case shows separate not-found state
• MatchHubDetails import in page changed to type-only from @/types/match
• Add tests/fixtures/matchFixtures.ts as the single test-only re-export for matchHubDetails and mockMatchDetails; no production file imports these
• Update match-hub-params test to use new fixture path and isError:true mock
• Add lib/wallet/tokenExpiry.ts: setTokenExpiresIn, isTokenNearExpiry, isTokenExpired, tokenRemainingMs with 60s EXPIRY_THRESHOLD_MS constant
• useAuth stores public expiry timestamp after login and refresh; clears on logout
• Add SessionExpiredModal component for pre-transaction re-auth prompt
• WalletDashboard checks isTokenNearExpiry() before any withdrawal; on near-expiry attempts silent refresh, shows SessionExpiredModal on failure, replays pending transaction after successful re-auth, redirects to login if refresh fails a second time
• Add 15 unit tests for tokenExpiry module covering all exported functions

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