This commit implements Phase 4 of the Sacred Pipeline, focusing on transaction resilience. It introduces:
- **Timeout Detection & Recovery**: New utilities in `src/lib/timeoutDetection.ts` to detect, categorize (minor, moderate, critical), and provide recovery strategies for timeouts across various sources (fetch, Supabase, edge functions, database). Includes a `withTimeout` wrapper.
- **Lock Auto-Release**: Implemented in `src/lib/moderation/lockAutoRelease.ts` to automatically release submission locks on error, timeout, abandonment, or inactivity. Includes mechanisms for unload events and inactivity monitoring.
- **Idempotency Key Lifecycle Management**: A new module `src/lib/idempotencyLifecycle.ts` to track idempotency keys through their states (pending, processing, completed, failed, expired) using IndexedDB. Includes automatic cleanup of expired keys.
- **Enhanced Idempotency Helpers**: Updated `src/lib/idempotencyHelpers.ts` to integrate with the new lifecycle management, providing functions to generate, register, validate, and update the status of idempotency keys.
- **Transaction Resilience Hook**: A new hook `src/hooks/useTransactionResilience.ts` that combines timeout handling, lock auto-release, and idempotency key management for robust transaction execution.
- **Submission Queue Integration**: Updated `src/hooks/useSubmissionQueue.ts` to leverage the new submission queue and idempotency lifecycle functionalities.
- **Documentation**: Added `PHASE4_TRANSACTION_RESILIENCE.md` detailing the implemented features and their usage.
Implement the destructive migration plan to remove the old approval flow entirely. This includes deleting the legacy edge function, removing the toggle component, simplifying frontend code, and updating documentation.
Update actions.ts and ApprovalTransactionToggle.tsx to default to the new atomic transaction RPC flow. The feature flag can now be used to disable the new flow for emergency rollback.
