- Add many-to-many relationships between Sale/Expense and Account models
- Create pivot tables for account_sale and account_expense with migrations
- Implement account syncing during sale/expense creation and editing
- Add accounts_list attribute to display comma-separated account names
- Introduce SaleService with DTO for sale creation logic
- Simplify sales table columns to show branch, reference, date, and creator
- Calculate and store aggregated financial fields from transactions
- Make series field read-only instead of disabled in sale form
- Move create/edit logic from relation managers to dedicated resource pages
- Add transaction handling with proper rollback in sale create/update
- Fix expense transaction creation by using correct array access
- Set default client from query parameter in sale/expense forms
- Exclude 'type' field from balance creation to prevent errors
