Implemented complete invoice deletion feature allowing users to delete
incorrectly generated invoices from both the view and list pages.
Changes:
- Added delete button to invoice view page with modal confirmation
- Added delete buttons to invoice list page with modal confirmation
- Implemented custom Tailwind modal matching project design patterns
- Modal displays invoice number and cascade deletion warning
- Full dark mode support with proper accessibility (ARIA attributes)
- Modal can be closed via Cancel button, clicking outside, or ESC key
Technical details:
- Backend route already existed (/invoices/<id>/delete)
- Cascade deletion automatically removes related items, goods, and payments
- Permission checks: only invoice creator or admins can delete
- Delete route returns to invoice list with success/error messages
Testing:
- Added 12 comprehensive tests covering deletion functionality
- Unit tests for basic deletion and cascade behavior
- Route tests for permissions and success/error cases
- Smoke tests for UI elements and complex deletion scenarios
- All tests passing ✅
The modal implementation follows the established pattern used in
kanban/columns.html, ensuring consistency across the application.
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