Remove .vscode from .gitignore to allow for project-specific settings. Introduce a VSCode task to run `npm run dev` automatically when the project is opened. Update environment configuration files and dependencies to enhance support for the Node adapter.
Fixes#13
- Fixed balance calculation logic in transaction update endpoint
- Added comprehensive test coverage for all error paths
- Added coverage/ directory to .gitignore
- Achieved 100% test coverage across all files
