Import a scenario

Nobody types 120 guests to try a tool out. Three example weddings, each carrying a guest list and a room that fits it.

Acceptance criteria

• Three scenario cards on the setup screen, above the manual configuration
• Each card shows the guest count, the room it brings, and the seat arithmetic already worked out
• Importing replaces the guest list and the room config together
• Importing over existing data asks first
• After import a chip names the loaded scenario
• Editing any config field detaches from the scenario and the chip reads "Custom"

Notes

Scenario data ships in the repo at public/scenarios/. KB-3 says what each one is for.