Add integration tests covering all acceptance criteria:
- Dashboard shows list of all exchanges
- Each exchange displays name, state, participant count, exchange date
- Exchanges sorted by exchange date (upcoming first)
- Visual indicator for exchange state
- Summary counts for draft, active, completed
- Empty state handling
Story: 2.2
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Co-Authored-By: Claude <noreply@anthropic.com>
Phil Skentelbery
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