Prevent multiple simultaneous authentication flows by:
- Adding static authInFlight promise tracking in AcpConnection
- Implementing runExclusiveAuth method in AuthStateManager
- Adding sessionCreateInFlight tracking in QwenAgentManager
- Ensuring only one auth flow runs at a time across different components
This prevents race conditions and duplicate login prompts when multiple components request authentication simultaneously.
- Create new approvalModeTypes.ts with ApprovalMode enum and helper functions
- Replace hardcoded string literals with ApprovalModeValue type
- Consolidate mode mapping logic using new helper functions
