[Tickets] Export the ticket list as CSV
| Independent | Uses the existing ticket list query; no other open work is needed |
|---|---|
| Negotiable | Columns and file name can change; Excel format is out of scope for now |
| Valuable | Teams can share and analyse tickets outside the app, a frequent support request |
| Estimable | About 1 day including tests |
| Small | One endpoint and one button, fits in a single PR |
| Testable | The export of a fixture project matches a known CSV file; current filters are respected |