Feat/mos 0011#16
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- Generic hook for persisting state to session/localStorage - Lazy initialiser reads stored value on mount - Handles corrupt JSON gracefully (removes + falls back) - Handles storage-full errors silently - Defaults to sessionStorage (clears on tab close)
- SimulationContext uses usePersistedState for investments, results, lastRequest, and timeframe (sessionStorage, cleared on tab close) - useSimulation reads/writes context instead of local useState; transient state (isSimulating, simulationError) stays local - InvestmentBuilder reads investments from context (survives nav) - InvestmentBuilder tests wrapped with SimulationProvider - All 90 tests pass, build clean
- 8 tests for usePersistedState: initial value, read/write storage, updater function, object serialisation, corrupt data handling, localStorage variant, default sessionStorage - 9 tests for SimulationContext: default state, missing provider guard, state updates, clearResults, sessionStorage persistence, restore on remount - Total: 107 tests passing (was 90)
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