My GHL import imports duplicate contacts — how do I fix it?

Senly deduplicates by default on name + email combination. If the same person is in GHL with two different mail addresses (e.g. `name@gmail.com` AND `name@company.com`), Senly sees that as two separate contacts.

Fix:

1. Clean up GHL first — merge duplicates there before importing.
2. Use the "Clear stage first" option on re-import to remove duplicates in Senly before importing again.
3. Merge manually in Senly: open one of the duplicates, click ⋮ → Merge with... and choose the other.