Wait List: run a separate list for every need

The Wait List has always supported more than a lobby queue — each Wait List Type is its own list — but the page described itself as "clients waiting at this location, in arrival order," which undersold it. The copy now matches the feature.

What changed:

• The page header now reads "Every wait list your team is running — filter by type to work one list."
• The Manage Wait List Types dialog now explains that each type is its own wait list — add one for every use.
• The Wait List documentation was rewritten around the same idea, with examples like a sensitivities list, openings with a specific stylist, and training services.

Nothing about how the Wait List works changed — types, filtering, queue order, and history all behave exactly as before.