- Fix upsert method to handle string/symbol keys with indifferent access
- Add missing show route and view for SimpleFin items
- Fix test fixtures to use correct user references
- Update test data to match real-world JSON format (string keys, BigDecimal)
- Apply code formatting and linting fixes (rubocop, erb_lint)
- Ensure all SimpleFin tests pass (16/16 passing)
- Add SimplefinItem model with sync capabilities and encryption
- Add SimplefinAccount model for account data mapping
- Implement Provider::Simplefin API client with token exchange
- Add SimpleFin protocol support with proper error handling
- Include sync jobs, importers, and processors for data flow
- Add family SimpleFin connectivity mixin
