* fix(enable-banking): refactor error handling and add missing GIN index
* fix(enable-banking): handle wrapped network errors and fix concurrent index migration
* fix(enable-banking): extract network errors to frozen constant
* fix(enable-banking): consolidate error handling and enforce strict localization
* fix(enable-banking): improve sync error handling and fix invalid test status
* test(enable_banking): use OpenStruct instead of mock for provider