Feature: Export events to CSV

Summary

Client-side CSV export of event listings.

User story

As a user, I want to export visible events to CSV so I can share or analyze them.

Scope

• Frontend utility downloadEventsCSV(filename, events, fields?).
• Include attendee count, dates as ISO.

Tasks

• Implement util (Blob + BOM + link download).
• Add button to list view; pass filtered events.
• Vitest unit test for CSV output.

Acceptance criteria

• Clicking “Export CSV” downloads a valid CSV with headers and data.
• Works with filters; handles commas/quotes correctly.

Test notes

• Verify escaped quotes and line breaks; optional fields blank.

Dependencies

• Depends on: “Filter events by category and date range”.